KING BILLION ELECTRONICS CO.， LTD 駿 億 電 子 股 份 有 限 公 司 HE89820 HE80000 SERIES A. HE89820 Introduction HE89820 is a member of 8-bit Micro-controller series used for telephone communication developed by King Billion Electronics Ltd. The built-in DTMF generator can generate the PSTN dialing tone directly. It can be applicable as Small/ Medium class telephone or communication product etc.. The instruction set of HE89820 are quite easy to learn and simple to use. Only about thirty instructions with four-type addressing mode are provided. Most of instructions take only 3 oscillator clocks (machine cycles). The processing power is enough to most of battery operation system. B. HE89820 Features zOperation Voltage： 2.4V – 5.5V zSystem Clock： DC ~ 8MHz @ 5.0V z DC ~ 4MHz @ 2.4V zInternal ROM： 8K Bytes(8K Program ROM) zInternal RAM： 512 Bytes. zDual Clock System ： Normal (Fast) clock： 32.768K ~ 8MHz z Slow clock： 32.768KHz zOperation Mode： DUAL、FAST、SLOW、IDLE、SLEEP Mode. zWith WDT (WATCH DOG TIMER) to prevent deadlock condition.. z24 bit Bi-directional I/O port. Mask Option can select PUSH-PULL or OPEN DRAIN output mode for each I/O pin. zBuilt-in DTMF Generator. zTwo external interrupts and three internal timer interrupts. zTwo 16-bit timer and one Time Base timer. zInstruction set： 32 instructions, 4 addressing mode.9-bit DATA POINTER for RAM and 13-bit TABLE POINTER for ROM. C. Application Circuit 1 V3.1E HE89820 KING BILLION ELECTRONICS CO.， LTD 駿 億 電 子 股 份 有 限 公 司 HE80000 SERIES No External Parts is necessary if user adopt Internal Fast RC Clock External Fast Clock: Crystal osc. 20P FXI 2MHZ 20P FXO External Fast Clock: RC osc. VDD VDD VDD FXI R1 50K 3V C1 FXO C2 SXI RSTP_N 0.1uF 100uF C3 SW1 0.1uF RESET SXO PRTC[7:0] PRTD[7:0] PRT10[7:0] GND DTMFO FXO FXI C: Please Ref . AN016 SXI SXO External Slow Clock: Crystal osc. 20P SXI MUTE TSTP_P BATTERY1 R > 8.2 KOhm FXI SDO 32.768K SXO 20P KEYTONE HE89820 External Slow Clock: RC osc. SXI R: Please ref . AN016 SXO 2 V3.1E