參數(shù)資料
型號: PICDEM2
廠商: Microchip Technology Inc.
英文描述: simple board
中文描述: 簡潔的主板
文件頁數(shù): 27/60頁
文件大?。?/td> 1037K
代理商: PICDEM2
PICDEM 2 User
s Guide
DS30374D-page 22
2001 Microchip Technology Inc.
5.1.3
TX and RX Routines
The
TX
and
RX
routines transmit and receive 8 data bits, respectively. Data is
transmitted/received one bit at a time by left bit-shifting the transmit/receive
buffer. A counter, set initially to 8, is decremented until all 8 bits of data are
sent/received. Finally, acknowledgment bits are received/transmitted. In the
case of transmission, if an acknowledgment is not received, an error flag is
set.
Figure 5.8: Transmit
Set counter for eight bits
(BITOUT)
Send Bit
(BITIN)
Rotate transmit buffer left
Read acknowledge bit
Return
Default bit out = 0
If shifted bit = 0, data bit = 0
else data bit = 1
8 bits transmitted
No
Yes
Acknowledgment
Received
Yes
ERR
No
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