Epson LQ 1050 Technical Manual - Page 188

REV.-A A.1.l CPU KPD781OHG The wPD78 10/781 1 is an 8-bit CPU and includes two 8 bit timer counters, an 8-bit A/D converter, 256 bytes of RAM, and a serial interface. A system can be easily constructed using this IC. The main features of this IC are as follows. q 256 bytes built-in RAM (addresses FFOOH-FFFFH) q 4096 bytes maks ROM (addresses O-FFOOH) for the 7811 CPU q Direct addressing of up to 64K bytes . 8-bit A/D converter q 158 instructions q 0.8 KS instruction cycle (15 MHz) q 16-bit event counter q Two 8-bit timer counters q 3 external and 8 internal interrupts; 6 priority levels and 6 interrupt addresses. q General purpose serial interface (asynchronous, synchronous, and 1/0 modes) q 1/0 line (781 1 :40-bit 1/0 port; 78 10:24-bit edge detection, 4 inputs) L q Zero corss detection q Standby function q Built-in clock pulse circuit q NMOS Figures A-1 and A-2 illustrate the 78 10/781 1 HG microprocessor, and Tables A-3 through A-6 describe its functions. PAO PA 1 PA2 PA3 PA4 PAS PA6 PA7 PBO Pal P82 PB3 PB4 PBS PB6 P87 Pco Pcl PC2 PC3 P124 Pcs PC6 PC7 ml INT 1 MODE 1 RESET MOOEO x2 xl v Ss 5 ~6 - 7 - 8 ~9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 ~ 18 ~ -H - 21 - 22 - 23 - - :: ~ 26 :; % 29 36 30 31 X u 32 3 3 vu Voo PD7 P06 P05 P04 PD3 P02 Pol Poo PF7 PF6 PF5 PF4 PF3 PF2 PF 1 PFO ALE G m AVCC VAREF AN7 AN6 AN5 AN4 AN3 AN2 AN] ANO AV ss Figure A-1. KPD7810/7811 Pin Diagram A-2