UPD17225

DATA SHEET MOS INTEGRATED CIRCUIT µPD17225, 17226, 17227, 17228 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER DESCRIPTION µPD17225, 17226, 17227, 17228 (hereafter called µPD17225 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, µPD17P218, to which data can be written only once, is also available. It is convenient either for evaluating the µPD17225 subseries programs or small-scale production of application systems. Detailed functions are described in the following manual. Be sure to read this manual when designing your system. µPD172×× Subseries User's Manual: U12795E FEATURES Infrared remote controller carrier generator circuit (REM output) 17K architecture: General-purpose register system Program memory (ROM), Data memory (RAM) µPD17225 Program memory (ROM) 4 K bytes (2048 × 16) Data memory (RAM) µPD17226 8 K bytes (4096 × 16) µPD17227 12 K bytes (6144 × 16) µPD17228 16 K bytes (8192 × 16) 111 × 4 bits 223 × 4 bits 8-bit timer : 1 channel Basic internal timer/Watchdog timer : 1 channel (W...