參數(shù)資料
型號: M38039F9-XXXSP
廠商: 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
文件頁數(shù): 51/119頁
文件大小: 1575K
代理商: M38039F9-XXXSP
Rev.1.00
REJ03B0212-0100
Apr 2, 2007
Page 51 of 117
3803 Group (Spec.L)
Serial I/O3
Serial I/O3 can be used as either clock synchronous or
asynchronous (UART) serial I/O3. A dedicated timer is also
provided for baud rate generation.
(1) Clock Synchronous Serial I/O Mode
Clock synchronous serial I/O3 mode can be selected by setting
the serial I/O3 mode selection bit of the serial I/O3 control
register (bit 6 of address 0032
16
) 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 register.
Fig 44. Block diagram of clock synchronous serial I/O3
Fig 45. Operation of clock synchronous serial I/O3
Serial I/O3 control register
Receive buffer register 3
Receive shift register 3
Clock control circuit
1/4
Baud rate generator 3
f(X
IN
)
1/4
Clock control circuit
Falling-edge detector
Transmit buffer register 3
Transmit shift register 3
Serial I/O3 status register
F/F
Address 0030
16
Receive buffer full flag (RBF)
Receive interrupt request (RI)
Shift clock
Serial I/O3 synchronous clock selection bit
Frequency division ratio 1/(n+1)
Address 002F
16
BRG count source selection bit
Address 0030
16
Shift clock
Transmit shift completion flag (TSC)
Transmit buffer empty flag (TBE)
Transmit interrupt request (TI)
Transmit interrupt source selection bit
Address 0031
16
Address 0032
16
Data bus
Data bus
P3
6
/S
CLK3
P3
4
/R
X
D
3
P3
5
/T
X
D
3
P3
7
/S
RDY3
(f(X
CIN
) in low-speed mode)
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
TBE = 0
TBE = 1
TSC = 0
Transfer shift clock
(1/2 to 1/2048 of the internal
clock, or an external clock)
Serial output T
X
D
3
Serial input R
X
D
3
Write pulse to receive/transmit
buffer register (address 0030
16
)
Overrun error (OE)
detection
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/O3 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 T
X
D pin.
3
: The receive interrupt (RI) is set when the receive buffer full flag (RBF) becomes “1”.
Receive enable signal S
RDY3
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