EM78452WM datasheet(32/54 Pages) EMC

32 / 54 page

EM78452

8-Bit Microcontroller

•

Product Specification (V1.0) 10.18.2007

(This specification is subject to change without further notice)

For Slaver

ORG 0X0

INITI:

JMP INIT

ORG 0X2

INTERRUPT:

MOV A,@0X55

MOV 0X06,A

MOV A,@0B11100110

MOV 0X0D,A

BS 0X0D,4

MOV A,@0X00

MOV 0X0B,A

BS 0X0D,4

NOP

JBC 0X0D,4

JMP $-2

BS 0X0D,4

0X03,2

MOV A,0X0A

MOV 0X06,A

XOR A,@0XAA

JBS 0X03,2

JMP SPI

JMP $-6

; Interrupt address

; Show a signal at Port 6 when entering

; interrupt

; Enable SPI, /SS disabled

; Keep SSE at 1 to wait for SCK signal in

order to shift data

; Move 00 to write buffer in order to keep

; master’s read buffer as 00

; Keep SSE at 1 to wait for SCK signal in

; order to shift data

; Polling loop for checking SPI

; transmission completed

; Keep SSE at 1 to wait for SCK signal in

; order to shift data

; Read master’s data from read buffer

; Check pass signal from read buffer

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