参数资料
型号: M38039G4H-XXXKP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件页数: 58/105页
文件大小: 1416K
代理商: M38039G4H-XXXKP
REJ03B0166-0113 Rev.1.13
Aug 21, 2009
Page 54 of 100
3803 Group (Spec.H QzROM version)
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 003216) 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 3.
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(XIN)
1/4
Clock control circuit
Falling-edge detector
Transmit buffer register 3
Transmit shift register 3
Serial I/O3 status register
F/F
Address 003016
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 002F16
BRG count source selection bit
Address 003016
Shift clock
Transmit shift completion flag (TSC)
Transmit buffer empty flag (TBE)
Transmit interrupt request (TI)
Transmit interrupt source selection bit
Address 003116
Address 003216
Data bus
P36/SCLK3
P34/RXD3
P35/TXD3
(f(XCIN) in low-speed mode)
P37/SRDY3
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 TXD3
Serial input RXD3
Write pulse to receive/transmit
buffer register 3 (address 003016)
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 3 when TSC=0, the transmit clock is generated continuously and serial data is output
continuously from the TXD3 pin.
3: The receive interrupt (RI) is set when the receive buffer full flag (RBF) becomes “1”.
Receive enable signal SRDY3
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