參數(shù)資料
型號(hào)： M38021E8
廠(chǎng)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(yè)數(shù)： 18/51頁(yè)
文件大小： 692K
代理商： M38021E8
MITSUBISHI MICROCOMPUTERS
3802 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
18
Serial I/O1
Serial I/O1 can be used as either clock synchronous or asynchro-
nous (UART) serial I/O. A dedicated timer is also provided for
baud rate generation.
Clock synchronous serial I/O mode
Clock synchronous serial I/O1 mode can be selected by setting
the mode selection bit of the serial I/O1 control register to “1”.
For clock synchronous serial I/O1, the transmitter and the receiver
must use the same clock. If an internal clock is used, transfer is
started by a write signal to the TB/RB (address 0018
16
).
Fig. 10 Block diagram of clock synchronous serial I/O1
Fig. 11 Operation of clock synchronous serial I/O1 function
1/4
X
IN
f(X
IN
)
1/4
F/F
P4
6
/S
CLK1
Serial I/O1 status register
Serial I/O1 control register
P4
7
/S
RDY1
P4
4
/R
X
D
P4
5
/T
X
D
Receive buffer
Address 0018
16
Receive shift register
Receive buffer full flag (RBF)
Receive interrupt request (RI)
Clock control circuit
Shift clock
Serial I/O1 synchronous
clock selection bit
Frequency division ratio 1/(n+1)
Baud rate generator
Address 001C
16
BRG count source selection bit
Clock control circuit
Falling-edge detector
Transmit buffer
Data bus
Address 0018
16
Shift clock
Transmit shift completion flag (TSC)
Transmit buffer empty flag (TBE)
Address 0019
16
Transmit interrupt request (TI)
Transmit interrupt source selection bit
Data bus
Address 001A
16
Transmit shift register
D
7
D
7
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
0
D
1
D
2
D
3
D
4
D
5
D
6
RBF = 1
TSC = 1
Overrun error (OE)
detection
TBE = 0
TBE = 1
TSC = 0
Transfer shift clock
(1/2 to 1/2048 of the internal
clock, or an external clock)
Serial output TxD
Serial input RxD
Write pulse to receive/transmit
buffer (address 0018
16
)
Notes 1 :
The transmit interrupt (TI) can be selected to occur either when the transmit buffer has emptied (TBE=1) or after the
transmit shift operation has ended (TSC=1), by setting the transmit interrupt source selection bit (TIC) of the serial I/O1
control register.
2 :
If data is written to the transmit buffer when TSC=0, the transmit clock is generated continuously and serial data is
output continuously from the TxD pin.
3 :
The receive interrupt (RI) is set when the receive buffer full flag (RBF) becomes “1” .
Receive enable signal
S
RDY1
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