EM78P451SWM datasheet(31/54 Pages) EMC

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EM78P451S

8-Bit Microcontroller with OTP ROM

Product Specification (V1.0) 06.01.2004

• 27

(This specification is subject to change without further notice)

For Slaver

ORG 0X0

INITI:

JMP INIT

ORG 0X2

INTERRUPT:

;Interrupt address

MOV A,@0X55

MOV 0X06,A

;Show a signal at Port 6 when entering interrupt

MOV A,@0B11100110

;Enable SPI, /SS disabled

MOV 0X0D,A

BS 0X0D,4

;Keep SSE at 1 to wait for SCK signal in order to shift data

MOV A,@0X00

;Move 00 to write buffer in order to keep master’s read buffer

as 00

MOV 0X0B,A

BS 0X0D,4

;Keep SSE at 1 to wait for SCK signal in order to shift data

NOP

JBC 0X0D,4

;Polling loop for checking SPI transmission completed

JMP $-2

BS 0X0D,4

;Keep SSE at 1 to wait for SCK signal in order to shift data

BC 0X03,2

MOV A,0X0A

MOV 0X06,A

;Read master’s data from read buffer

XOR A,@0XAA

;Check pass signal from read buffer

JBS 0X03,2

JMP $-6

JMP SPI

ORG 0X30

INIT:

CLRA

IOW 0X05

IOW 0X06

EM78P451SWM Datasheet(PDF) 31 Page - ELAN Microelectronics Corp

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