參數(shù)資料
型號(hào)： M38859M5-XXXHP
廠(chǎng)商： Renesas Technology Corp.
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)： 32/103頁(yè)
文件大?。?/td> 1580K
代理商： M38859M5-XXXHP
31
3885 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
SERIAL I/O
Serial I/O
Serial I/O works as either clock synchronous serial I/O mode or
universal asynchronous receiver transmitter (UART) serial I/O
mode. A dedicated timer is also provided for baud rate generation.
(1) Clock Synchronous Serial I/O Mode
Clock synchronous serial I/O mode can be selected by setting the
serial I/O mode selection bit of the serial I/O control register (bit 6
of SIOCON) to
“
1
”
.
For clock synchronous serial I/O, the transmitter and the receiver
must use the same clock. When an internal clock is used, the
transfer starts by writing to the TB.
Fig. 26 Block diagram of clock synchronous serial I/O
Fig. 27 Operation of clock synchronous serial I/O function
1/4
1/4
F/F
P4
6
/S
CLK
Serial I/O status register
Serial I/O control register
P4
7
/S
RDY
/CLKRUN
P4
4
/R
X
D
P4
5
/T
X
D
f(X
IN
)
Receive buffer register
Receive shift register
Receive buffer full flag (RBF)
Receive interrupt request (RI)
Clock control circuit
Shift clock
Serial I/O synchronous
clock selection bit
Baud rate generator
BRG count source selection bit
Clock control circuit
Falling-edge detector
Transmit buffer register
Data bus
Shift clock
Transmit shift completion flag (TSC)
Transmit buffer empty flag (TBE)
Transmit interrupt request (TI)
Transmit interrupt source selection bit
Data bus
Transmit shift register
(f(X
CIN
) in low-speed
mode)
Frequency division ratio 1/(n+1)
Address 0018
16
Address 001A
16
Address 001C
16
Address 0018
16
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
TSC = 1
TBE = 1
TSC = 0
Transfer shift clock
(1/2 to 1/2048 of the internal
clock, or an external clock)
TxD pin
RxD pin
Write pulse to transmit buffer
register (TB)
Notes 1:
As the transmit interrupt (TI), which can be selected, 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/O
control register.
2:
If data is written to the transmit buffer register when TSC=0, the transmit clock is generated continuously and the next
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
”
.
S
RDY
pin
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