MOS INTEGRATED CIRCUIT
4-BIT SINGLE-CHIP MICROCONTROLLER
FOR SMALL GENERAL-PURPOSE INFRARED
REMOTE CONTROL TRANSMITTER
µPD17230, 17231, 17232, 17233, 17234, 17235, 17236 (hereafter called µPD17236 subseries) are 4-bit single-
chip microcontrollers for small general-purpose infrared remote control transmitters.
It employs a 17K architecture of general-purpose register type devices for the CPU, and can directly execute
operations between memories instead of the conventional method of executing operations through the accumulator.
Moreover, all the instructions are 16-bit 1-word instructions which can be programmed efficiently.
In addition, a one-time PROM model, µPD17P236Note, to which data can be written only once, is also available.
It is convenient either for evaluating the µPD17236 subseries programs or small-scale production of application
Note Under development
Detailed functions are described in the following manual. Be sure to read this manual when designing your
µPD172×× Subseries User's Manual: U12795E
• Infrared remote controller carrier generator circuit (REM output)
• 17K architecture: General-purpose register system
• Program memory (ROM), Data memory (RAM)
µPD17230 µPD17231 µPD17232 µPD17233 µPD17234 µPD17235 µPD17236
4 K bytes 8 K bytes 12 K bytes 16 K bytes 20 K bytes 24 K bytes 32 K bytes
memory (ROM) (2048 × 16) (4096 × 16) (6144 × 16) (8192 × 16) (10240 × 16) (12288 × 16) (16384 × 16)
Data memory 223 × 4 bits
• 8-bit timer
: 1 channel
• Basic internal timer/Watchdog timer : 1 channel
• Instruction execution time (can be changed in two steps)
at fX = 4 MHz
: 4 µs (high-speed mode)/8 µs (ordinary mode)
at fX = 8 MHz
: 2 µs (high-speed mode)/4 µs (ordinary mode)
• External interrupt pin (INT)
• I/O pins
• Supply voltage
: VDD = 2.2 to 3.6 V (at fX = 8 MHz (high-speed mode))
VDD = 2.0 to 3.6 V (at fX = 4 MHz (high-speed mode))
• Low-voltage detector circuit (mask option)
Unless otherwise specified, the µPD17236 is treated as the representative model throughout this document.
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for availability
and additional information.
Document No. U14360EJ1V0DS00 (1st edition)
Date Published July 1999 N CP (K)
Printed in Japan