參數(shù)資料
型號(hào)： MC68HC705BD7B
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP42
封裝： SDIP-42
文件頁(yè)數(shù)： 51/85頁(yè)
文件大?。?/td> 302K
代理商： MC68HC705BD7B
SECTION 9: DDC12AB INTERFACE
MOTOROLA
Page 45
MC68HC05BD7 Rev. 2.0
GENERAL RELEASE SPECIFICATION
PRELIMINARY
cleared, the register can load the received data again and set the RXIF flag to generate
interrupt request for reading the newly received data.
9.4
Data Sequence
9.5
Program Algorithm
The Figure 9-1 shows the algorithm of slave mode interrupt routine of DDC12B protocol.
The Figure 9-2 shows the algorithm of master mode setup and interrupt service routine.
When the DDC module detects an arbitration loss in master mode, it will release both SDA
and SCL lines immediately. But if there is no further "stop condition" detected, the module
will be hanged up. So it is recommended to have time-out software to recover from such ill
condition. The software can start the time-out counter by looking at the BB (Bus Busy) in
the bit 5 of DMCR and reset the counter when the completion of one byte transmission. If
the time-out occurred, program can clear DEN bit to release the bus, and then set DEN bit
START Address 0 ACK TX Data1 ACK
TX DataN NAK STOP
TXBE=0
MAST=1
TXIF=1
TXBE=1
MRW=0
TXIF=1
TXBE=1
NAKIF=1
MAST=0
TXBE=0
START Address 1 ACK RX Data1 ACK
RX DataN NAK STOP
RXBF=0
MAST=1
RXIF=1
RXBF=1
RXIF=1
RXBF=1
NAKIF=1
START Address 1 ACK TX Data1 ACK
TX DataN NAK STOP
TXBE=0
RXBF=0
RXIF=1
RXBF=1
TXIF=1
TXBE=1
START Address 0 ACK RX Data1 ACK
RX DataN NAK STOP
TXBE=0
RXBF=0
RXIF=1
RXBF=1
RXIF=1
RXBF=1
RXIF=1
RXBF=1
MAST=0
a) Master Transmit mode
b) Master Receive mode
c) Slave Transmit mode
TXiF=1
TXBE=1
MATCH=1
d) Slave Receive mode
MATCH=1
SRW=0
SRW=1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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