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參數(shù)資料
| 型號： | M38C89MF-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP144 |
| 封裝： | 20 X 20 MM, 0.50 MM PITCH, PLASTIC, LQFP-144 |
| 文件頁數(shù)： | 18/55頁 |
| 文件大小： | 981K |
| 代理商： | M38C89MF-XXXFP |
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24
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
38C8 Group
SERIAL I/O
Serial I/O can be used as either clock synchronous or asynchronous
(UART) serial I/O. A dedicated timer (baud rate generator) is also
provided for baud rate generation.
(1) Clock Synchronous Serial I/O Mode
Clock synchronous serial I/O can be selected by setting the mode
selection bit of the serial I/O control register to “1”.
For clock synchronous serial I/O, 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 transmit/receive buffer registers.
Fig. 20 Block diagram of clock synchronous serial I/O
Fig. 21 Operation of clock synchronous serial I/O function
P46/SCLK
P47/SRDY
P44/RXD
P45/TXD
f(XIN)
1/4
F/F
Serial I/O status register
Serial I/O control register
Receive buffer register
Address 001816
Receive shift register
Receive buffer full flag (RBF)
Receive interrupt request (RI)
Clock control circuit
Shift clock
Serial I/O
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
Data bus
Address 001816
Shift clock
Transmit shift register 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 buffer register
Transmit shift register
(f(XCIN) in low-speed mode)
Receive enable signal SRDY
D7
D0
D1
D2
D3
D4
D5
D6
RBF = 1
TSC = 1
TBE = 0
TBE = 1
TSC = 0
Transmit/receive shift clock
(1/2 to 1/2048 of internal clock,
or an external clock)
Serial output TXD
Serial input RXD
Write signal to receive/transmit
buffer register (address 001816)
Overrun error (OE)
detection
Notes 1: The transmit interrupt (TI) can be selected to occur either when the transmit buffer register 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/O control register.
2: If data is written to the transmit buffer register 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” .
D7
D0
D1
D2
D3
D4
D5
D6
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