EM78862C Просмотр технического описания (PDF) - ELAN Microelectronics

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EM78862C

8-Bit Microcontroller

ELAN Microelectronics 

EM78862C

8-Bit RISC Type Microprocessor

6 Functional Descriptions

6.1 Operational Registers

ADDRESS

REGISTER

(PAGE0)

REGISTER

(PAGE1)

CONTROL REGISTER

(PAGE0)

CONTROL REGISTER

(PAGE1)

00 R0

01 R1(TCC buffer)

02 R2(PC)

03 R3(STATUS)

04 R4(RSR, BANK SELECT)

R3(7)

R3(5,6)

05 R5(Program ROM page)

IOC5(P8S,P9S)

06

07 R7(PORT 7)

IOC7 (PORT7 IO control)

08 R8(PORT 8)

IOC8 (PORT8 IO control)

09 R9(PORT 9)

IOC9 (PORT9 IO control

0A RA(CLOCK,WDT)

0B

RA(LCD_A0~7) IOCA(COUNTER1,2,

RB (LCD_ D0~7)

prescaler and source)

IOCA(PORT7 pull high)

0C

RC(RAM_D0~7)

0D

RD(RAM_A0~7) IOCD(COUNTER1 PRESET)

0E RE(Key scan , LCD control) RE( RAM_A8~10) IOCE(COUNTER2 PRESET)

0F RF(Interrupt flag)

IOCF(Interrupt control)

10

: 16 byte COMMON

1F

REGISTER

20

:

R4(7,6) 3F

BANK0 , BANK1, BANK2 ,BANK3

32X8 32X8 32X8 32X8

COMMON REGISTER

LCD RAM(32Sx16C)

RA PAGE1 => address

RB PAGE1 => data

DATA RAM(1.25KB=0~4FFh)

RD PAGE1 => address7..0

RE PAGE1 => address10..8

RC PAGE1 => data

Fig. 3 Data Memory Configuration

6.1.1 R0 (Indirect Address 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

MOV 0x04,A

MOV A,@0xAA

MOV 0x00,A

;Store an address at R4 for indirect addressing

;Write data 0xAA to R20 at Bank0 through R0

6•

Product Specification (V2.1) 07.13.2005

(This specification is subject to change without further notice)

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