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參數資料
型號: MC68HC705V8
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數: 17/28頁
文件大小: 220K
代理商: MC68HC705V8
AN1224/D
MOTOROLA
17
Figure 7b. MDLC Interrupt Service Routine (concluded)
IS TRANSMIT
INTERRUPT
PENDING
NO
YES
CLEAR "rticnt"
IS RECEIVE
INTERRUPT
PENDING
NO
YES
DISABLE RTI
INTERRUPT
STORE RECEIVED DATA
BYTE COUNT INTO RAM
LOCATION "byte_cnt"
LOAD VALUE IN
"byte_cnt" INTO INDEX
REGISTER
STORE ADDRESS VALUE
IN MCU RAM LOCATION
"buff_ndx"
A
E
LOAD VALUE IN "buff_ndx"
INTO INDEX REGISTER
F
RETURN FROM
INTERRUPT
D
ADD RECEIVED DATA BYTE
COUNT TO STARTING
ADDRESS OF MCU RAM
MSG BUFFER MATCHING
MESSAGE ID
DECREMENT RESULT
TO OBTAIN ENDING
ADDRESS FOR STORING
RECEIVED MESSAGE DATA
BYTES
READ RECEIVED
MESSAGE DATA BYTE IN
LOCATION "rxdata2,X"
F
STORE MESSAGE DATA
BYTE IN RAM BUFFER AT
LOCATION "fmsgx,X"
STORE DATA IN
ACCUMULATOR INTO
MRSR TO RELEASE
Rx BUFFER
IS "byte_cnt" = 0
NO
YES
DECREMENT "buff_ndx"
DECREMENT "byte_cnt"
LOAD $00 INTO MTCR TO
CLEAR TRANSMIT
INTERRUPT
G
G
Tx Interrupt
Sequence
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