AN1212 Freescale Semiconductor / Motorola, AN1212 Datasheet - Page 36

• Manufacturer Part Number: AN1212
• Description: J1850 Multiplex Bus Communication Using the MC68HC705C8 and the SC371016 J1850 Communications Interface (JCI)
• Manufacturer: Freescale Semiconductor / Motorola

AN1212/D
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*** Flush Rx FIFO Subroutine ***
RXFLUSH: lda
*** Flush Tx FIFO Subroutine ***
TXFLUSH: lda
************************************************************************
*
*
*
************************************************************************
*** Received Message Interrupt Service Routine ***
J1850 Multiplex Bus Communication Using the MC68HC705C8
and the SC371016 J1850 Communications Interface (JCI)
Freescale Semiconductor, Inc.
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sta
jsr
rts
sta
jsr
rts
org
lda
sta
lda
sta
lda
sta
jsr
jsr
clrx
lda
cmp
beq
incx
cmp
beq
incx
Received Message Interrupt Service Routine
#flshfifo
command
TRANSFER
#flshtx
command
TRANSFER
service
command
cmdtemp
data
datatemp
#flshbyte
command
TRANSFER
TRANSFER
data
#id1
getmsg
#id2
getmsg
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;Load "flush Rx FIFO" command
;into RAM location "command"
;Call "TRANSFER" subroutine to transfer
;data and command bytes to JCI
:Return From Subroutine
;Load "flush Tx FIFO" command
:into RAM location "command"
;Call TRANSFER subroutine to transfer
;data and command bytes to JCI
;Return From Subroutine
;Save current command byte in
;temporary storage location
;Save current data bye in
;temporary storage location
;Load "flush first byte in FIFO" command
;in command storage location
;Call TRANSFER subroutine, retrieving
;Status and pri/type data byte.
;Call TRANSFER subroutine, retrieving
;Status and target i.d. data byte
;Clear X-Register
;Load target i.d. byte into acc.
;Compare target i.d. with first message
;buffer i.d., if match, get message
;Increment X-Register
;Compare target i.d. with next message
;buffer i.d., if match, get message
;Increment X-Register
MOTOROLA
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