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EM78871H Datasheet(PDF) 11 Page - ELAN Microelectronics Corp |
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EM78871H Datasheet(HTML) 11 Page - ELAN Microelectronics Corp |
11 / 59 page EM78871 8-bit Micro-controller __________________________________________________________________________________________________________________________________________________________________ * This specification is subject to be changed without notice. 8/23/04 (V1.5) 11 VII.Functional Descriptions VII.1 Operational Registers Fig.4 control register configuration VII.2 Operational Register Detail Description R0 (Indirect Addressing Register) R0 is not a physically implemented register. It is useful as indirect addressing pointer. Any instruction using R0 as register actually accesses data pointed by the RAM Select Register (R4). Example: Mov a,@0x20 ;store a address at R4 for indirect addressing Mov 0x04,A Mov a,@0xAA ;write data 0xAA to R20 at bank0 through R0 Mov 0x00,A 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 : 1F 20 : 3F R0 R1(TCC buffer) R2(PC) R3(STATUS) R4(RSR, BANK SELECT R5(PORT57..PORT55 Program ROM PAGE) R6(PORT6) R7(PORT7) R8(PORT8) R9(PORT9) RA(CPU MODE,CLOCK, FSK,WDT control) RB(PORTB) RC(PORTC) RD(Comparator control) RE(Key scan , LCD control) RF(Interrupt flag) 16 byte COMMON REGISTER BANK0 , BANK1, BANK2 ,BANK3 32X8 32X8 32X8 32X8 COMMOM REGISTER R4(SPI status and control R5(SPI data buffer) R6 (Unused) R7(Unused) R8(Unused) R9(EDD,LCDA8) RC(DATA RAM data buffer) RD(DATA RAM address address 7 .. address 0) RE(,DATA RAM address address 11 .. address 8) ADDRESS REGISTER (PAGE0) REGISTER (PAGE1) CONTROL REGISTER (PAGE0) IOC5(IOC55,56,57,P8S, P9S,PBS,PCS) IOC6(PORT6 IO control) IOC7 (PORT7 IO control) IOC8 (PORT8 IO control) IOC9 (PORT9 IO control IOCA(COUNTER1,2, prescaler and source) IOCB(PORTB IO control) IOCC(PORTC IO control) IOCD(COUNTER1 PRESET) IOCE(COUNTER2 PRESET) IOCF(Interrupt control) R3(7) IOC5(Key tone, LCD bias control) IOC6 (current DA) IOC7(key strobe , seg7 .. seg0) IOC8(key strobe, seg15.. seg8) IOC9(DTMF receiver control) IOCA(PORT7 pull high) IOCB(PORT6 pull high) IOCC(Tone1) IOCD(Tone2) IOCE CONTROL REGISTER (PAGE1) R3(5,6) RA(LCD RAM address) RB (LCD RAM data buffer) R4(7,6) LCD RAM RA PAGE1 => address RB PAGE1 =>data DATA RAM RD PAGE1 => address7..0 RC PAGE1 =>data RE PAGE1 => address11..8 IOC6 (Port s/w, LCDDV, CDAL) R3(5,6) CONTROL REGISTER (PAGE2) IOCE IOC5 ( Stack Pointer ) |
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