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參數(shù)資料
| 型號： | M38B79FFFP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁數(shù)： | 38/109頁 |
| 文件大小： | 1559K |
| 代理商： | M38B79FFFP |
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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
38
(2) Asynchronous serial I/O (UART) mode
The asynchronous serial I/O (UART) mode can be selected by
clearing the serial I/O2 mode selection bit (b6) of the serial I/O2
control register (address 001D
16
) to
“
0
”
. Eight serial data transfer
formats can be selected and the transfer formats used by the
transmitter and receiver must be identical.
The transmit and receive shift registers each have a buffer (the
two buffers have the same address in memory). Since the shift
register cannot be written to or read from directly, transmit data is
written to the transmit buffer, and receive data is read from the re-
ceive buffer. The transmit buffer can also hold the next data to be
transmitted, and the receive buffer can receive 2-byte data con-
tinuously.
Fig. 39 Operation of UART serial I/O2 function
Fig. 38 Block diagram of UART serial I/O2
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TSC=0
TBE=1
RBF=0
TBE=0
TBE=0
RBF=1
RBF=1
ST
D
0
D
1
SP
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0
D
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SP
TBE=1
TSC=1*
ST
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D
1
SP
D
0
D
1
ST
SP
Transmit or receive clock
* Generated at 2nd bit in 2-stop
bit mode
1 start bit
7 or 8 data bit
1 or 0 parity bit
1 or 2 stop bit
Serial I/O2 input R
X
D
Write-in signal to
transmit buffer register
Serial I/O2 output T
X
D
Read-out signal from receive
buffer register
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