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K0S Family
Description
PD7894xx
8-Bit Microcontrollers with LCD
The PD7894xx single-chip microcontrollers contain an LCD controller capable of controlling and directly driving up to 112 LCD segments. With a variety of integrated peripherals, these devices have low EMI emissions and are fabricated with NEC's 0.35-micron process technology. The PD7894xx devices also provide very low-power operating modes using two on-chip oscillator circuits. The low EMI emissions, low-power operation, and serial communications make these devices ideal for lownoise, battery-powered applications that require serial communication. A flash version is available, as is an extensive tool set consisting of a software simulator, C compiler, relocatable assembler, screen debugger, and in-circuit emulator.
Specifications
* * * * *
Clock frequency: 1 to 5 MHz Performance: 400 ns min. instruction execution time Operating voltage: 1.8-5.5V EMI emissions: 10 -15 dB lower than most microcontrollers Power consumption - Normal operation: 0.8 mW - Halt mode: 0.6 mW - Stop mode: 0.0001 mW Package: 80-pin QFP - 14 x 14 x 2.70 mm - 12 x 12 x 1.05 mm
*
Block Diagram
02RC-0002B (02/02)
Features
* * * * * * * * * * *
64 KB linear address space 12 KB-24 KB internal ROM 32 KB flash memory 512-byte RAM 28 segment x 4 common LCD controller Seven-channel 8-bit or 10-bit A/D converter with 14-s conversion time One 16-bit timer/event counter Three 8-bit timer/event counters One real-time clock One watchdog/interval timer One serial channel - UART/synchronous channel - Baud rate generator 43 general-purpose I/O pins One comparator 0.35-micron CMOS process technology
* * *
Functional Description
CPU
The core of the K0S family is a powerful 8-bit CPU fabricated with 0.35 m process technology that ensures an excellent power/performance ratio for the PD7894xx. The CPU executes a set of 47 optimized instructions. Eight 8-bit general registers can be concatenated to four 16-bit registers to enable 16-bit operations. Bit manipulation operations are supported on the entire RAM address space. The PD7894xx devices offer a rich choice of on-chip memory combinations, including mask ROM and flash versions. The flash memory can be written even with the device mounted in the target system. The devices have nine ports with a total of 43 I/O pins. Thirty-two CMOS I/O pins feature internal pull-up resistors that can be enabled via software when the port is used for input. Seven are CMOS input pins and four are N-channel open-drain pins. The on-chip LCD controller/driver automatically generates up to 28 segment signal outputs and four common signal outputs. The output signals are based on automatic display data memory read. Five different display modes and four different frame frequencies can be selected via internal control registers. A seven-channel A/D converter with 10-bit (PD78940x = 8-bit) resolution is provided on chip. An external analog value, within the reference voltage range, can be converted by successive approximation into a 10-bit (8-bit) digital value. The minimum conversion time is less than 15 s at 5 MHz.
Memory
Ports
LCD Controller/ Driver
A/D Converter
PD7894xx
Functional Description
8-Bit Microcontrollers with LCD
Serial Interface
All devices have a serial interface that can be operated in asynchronous serial interface (UART) mode or in three-wire clocked serial interface (CSI) mode via a dedicated baud rate generator. In addition, the baud rate can be defined by scaling the input clock. The UART also features full-duplex operation. In CSI mode, an 8-bit data transfer executes via three lines supporting simultaneous transmit and receive operations to reduce data transfer processing time. The devices have two 8-bit timer/event counters, one 8-bit and one 16-bit timer, as well as a watchdog timer. The timers can be used as interval timers and external event counters, or to generate square waves of arbitrary frequency. The watchdog timer has interval timer functions, generates non-maskable or maskable interrupts, and is used to detect inadvertent program loops. The clock generator provides the operating frequency supplied to the CPU and peripheral hardware and requires an external crystal (1 to 5 MHz). The system clock, controlled by the processor clock control (PCC) register, uses this source to generate the internal operating frequency. Optionally the operating frequency also can be prescaled. Executing the Stop instruction stops oscillation. For power-saving purposes, the devices have a subsystem clock operating at 32.768 kHz. The interrupt controller handles various interrupt requests issued by internal peripheral hardware or external devices. Four external and 12 internal interrupts are incorporated as maskable interrupts, with a priority of 0 to 7 . The comparator compares an input voltage with the reference voltage. The result can be read using memory manipulation instruction.
Timer
Clock Generator
Interrupt controller
Comparator
Ordering Information
Power-Saving Features: Normal, Halt and Stop Modes
Modes and Typical Power at 5 MHz
Normal Mode: Chip 100% On Voltage
5V 2V
Halt Mode: CPU Clock Off Main and subsystem clocks On
6.0 mW 0.6 mW
Stop Mode: Main Clock Off
Main and subsystem clocks On
28 mW 0.8 mW
32 kHz subsystem clock On
0.13 mW 0.005 mW
32 kHz subsystem clock not used
0.0005 mW 0.0001 mW
PD7894xx
Ordering Information (Continued)
8-Bit Microcontrollers with LCD
Documentation
Document Number
U11047EJ2V0UM00 U12358EJ1V0UM00* U12240EJ1V0PM00* U12302EJ1V0PM00* U12321EJ1V0PM00*
* Preliminary document
Device
K0S PD7894xx PD78940x PD78941x PD78F9418
Type
Instruction Manual User' s Manual Data Sheet Data Sheet Data Sheet
Ordering Information
PD78940x Part Number
PD789405GC/GK PD789406GC/GK PD789407GC/GK
PD78941x 8-Bit A/D
7 channels 7 channels 7 channels
Internal ROM
12 KB mask ROM 16 KB mask ROM 24 KB mask ROM
Part Number
PD789415GC/GK PD789416GC/GK PD789417GC/GK PD78F9418GC/GK
Internal ROM
12 KB mask ROM 16 KB mask ROM 24 KB mask ROM 32 KB mask ROM
10-Bit A/D
7 channels 7 channels 7 channels 7 channels
The information in this document is current as of February 2002. The information is subject to change without notice. For actual design-in, refer to the latest publications of NEC's data sheets or data books, etc., for the most up-to-date specifications of NEC semiconductor products. Not all products and/or types are available in every country. Please check with an NEC sales representative for availability and additional information. No part of this document may be copied or reproduced in any form or by any means without prior written consent of NEC. NEC assumes no responsibility for any errors that may appear in this document. NEC does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from the use of NEC semiconductor products listed in this document or any other liability arising from the use of such products. No license, express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of NEC or others. Descriptions of circuits, software and other related information in this document are provided for illustrative purposes in semiconductor product operation and application examples. The incorporation of these circuits, software and information in the design of customer's equipment shall be done under the full responsibility of customer. NEC assumes no responsibility for any losses incurred by customers or third parties arising from the use of these circuits, software and information. While NEC endeavours to enhance the quality, reliability and safety of NEC semiconductor products, customers agree and acknowledge that the possibility of defects thereof cannot be eliminated entirely. To minimize risks of damage to property or injury (including death) to persons arising from defects in NEC semiconductor products, customers must incorporate sufficient safety measures in their design, such as redundancy, fire-containment and anti-failure features. NEC semiconductor products are classified into the following three quality grades: "Standard", "Special" and "Specific". The "Specific" quality grade applies only to semiconductor products developed based on a customer-designated "quality assurance program" for a specific application. The recommended applications of a semiconductor product depend on its quality grade, as indicated below. Customers must check the quality grade of each semiconductor product before using it in a particular application. "Standard": Computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots. "Special": Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support). "Specific": Aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems and medical equipment for life support, etc. The quality grade of NEC semiconductor products is "Standard" unless otherwise expressly specified in NEC's data sheets or data books, etc. If customers wish to use NEC semiconductor products in applications not intended by NEC, they must contact an NEC sales representative in advance to determine NEC's willingness to suppor t a given application. (Note) (1) "NEC" as used in this statement means NEC Corporation and also includes its majority-owned subsidiaries. (2) "NEC semiconductor products" means any semiconductor product developed or manufactured by or for NEC (as defined above).
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Printed in U.S.A. Document No. U16015EU1V0PB00

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