M38040FBHKP datasheet(47/116 Pages) RENESAS

47 / 116 page

Rev.1.01

Jan 25, 2005

page 47 of 114

REJ03B0131-0101Z

3804 Group (Spec. H)

Serial I/O3

Serial I/O3 can be used as either clock synchronous or asynchro-

nous (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.

Fig. 40 Block diagram of clock synchronous serial I/O3

Fig. 41 Operation of clock synchronous serial I/O3

1/4

F/F

P36/SCLK3

Serial I/O3 status register

Serial I/O3 control register

P37/SRDY3

P34/RXD3

P35/TXD3

Receive buffer register 3

Address 003016

Receive shift register 3

Receive buffer full flag (RBF)

Receive interrupt request (RI)

Clock control circuit

Shift clock

Serial I/O3 synchronous

clock selection bit

Frequency division ratio 1/(n+1)

Baud rate generator 3

Address 002F16

BRG count source selection bit

Clock control circuit

Falling-edge detector

Transmit buffer register 3

Data bus

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

Data bus

Address 003216

Transmit shift register 3

f(XIN)

(f(XCIN) in low-speed mode)

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 (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 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 SRDY3

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