參數(shù)資料
型號(hào): 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(yè)數(shù): 13/28頁(yè)
文件大小: 220K
代理商: MC68HC705V8
AN1224/D
MOTOROLA
13
Figure 5. Example Transmit Sequence
SET I-BIT TO PREVENT
INTERRUPTS
LOAD HEADER
& DATA BYTES
INTO MCU RAM,
BEGINNING AT "txbuf"
LOAD BYTE
COUNT
INTO MCU RAM
LOCATION
"txcount"
BEGIN TRANSMIT
SEQUENCE
USING INDEXED
ADDRESSING, LOAD
BYTE OF MESSAGE
STORED IN "txbuf,X"
INTO "txdata0,X"
ENABLE REAL TIME
INTERRUPT (RTI)
OF CORE TIMER
IS INDEX
REGISTER =0
NO
YES
LOAD VALUE IN
"txcount" INTO INDEX
REGISTER AND
DECREMENT BY ONE
END OF TRANSMIT
SEQUENCE
CLEAR I-BIT TO ALLOW
INTERRUPTS
DECREMENT VALUE
IN INDEX REGISTER
BY ONE
LOAD VALUE IN
"txcount" INTO MTCR,
INITIATING FRAME
TRANSMISSION
TRANSMIT subroutine
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