參數(shù)資料
型號(hào)： M3802
廠商： Mitsubishi Electric Corporation
英文描述： Single Chip 8 Bits Microcomputer(8位單片機(jī))
中文描述： 單芯片8位單片機(jī)（8位單片機(jī)）
文件頁(yè)數(shù)： 19/51頁(yè)
文件大小： 554K
代理商： M3802
MITSUBISHI MICROCOMPUTERS
3802 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
19
Asynchronous serial I/O (UART) mode
Clock asynchronous serial I/O mode (UART) can be selected by
clearing the serial I/O mode selection bit of the serial I/O control
register to “0”.
Eight serial data transfer formats can be selected, and the transfer
formats used by a transmitter and receiver must be identical.
The transmit and receive shift registers each have a buffer, but the
two buffers have the same address in memory. Since the shift reg-
ister 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 hold a character while the next charac-
ter is being received.
Fig. 12 Block diagram of UART serial I/O
f(X
IN
)
1/4
OE
PE FE
1/16
1/16
Data bus
Receive buffer
Address 0018
16
Receive shift register
Receive buffer full flag (RBF)
Receive interrupt request (RI)
Baud rate generator
Address 001C
16
Frequency division ratio 1/(n+1)
ST/SP/PA generator
Transmit buffer
Data bus
Transmit shift register
Address
0018
16
Transmit shift completion flag (TSC)
Transmit buffer empty flag (TBE)
Address
0019
16
Serial I/O1 status register
Transmit interrupt request (TI)
STdetector
SP detector
UART control register
Address 001B
16
Character length selection bit
Address 001A
16
BRG count source selection bit
Transmit interrupt source selection bit
Serial I/O1 synchronous clock selection bit
Clock control circuit
Character length selection bit
7 bits
8 bits
Serial I/O1 control register
P4
6
/S
CLK1
P4
4
/R
X
D
P4
5
/T
X
D
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