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参数资料
| 型号： | M38067ECAGP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 0.65 MM PITCH, PLASTIC, QFP-80 |
| 文件页数： | 13/58页 |
| 文件大小： | 801K |
| 代理商： | M38067ECAGP |
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19
MITSUBISHI MICROCOMPUTERS
3806 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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 001816).
Fig. 10 Block diagram of clock synchronous serial I/O1
Fig. 11 Operation of clock synchronous serial I/O1 function
1/4
XIN
1/4
F/F
P46/SCLK1
Serial I/O1 status register
Serial I/O1 control register
P47/SRDY1
P44/RXD
P45/TXD
f(XIN)
Receive buffer
Address 001816
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 001C16
BRG count source selection bit
Clock control circuit
Falling-edge detector
Transmit buffer
Data bus
Address 001816
Shift clock
Transmit shift completion flag (TSC)
Transmit buffer empty flag (TBE)
Transmit interrupt request (TI)
Transmit interrupt source selection bit
Address 001916
Data bus
Address 001A16
Transmit shift register
D7
D0
D1
D2
D3
D4
D5
D6
D0
D1
D2
D3
D4
D5
D6
RBF = 1
TSC = 1
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 001816)
Overrun error (OE)
detection
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 SRDY1
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