7906 datasheet(270/531 Pages) RENESAS

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SERIAL I/O

7906 Group User’s Manual Rev.2.0

11-29

11.3 Clock synchronous serial I/O mode

Fig. 11.3.8 Initial setting example for relevant registers when receiving

UART0 transmit/receive mode register (Address 3016)

UART1 transmit/receive mode register (Address 3816)

Internal/External clock select bit

0: Internal clock

1: External clock

✕✕

✕: It may be either “0” or “1.”

Selection of clock synchronous serial

I/O mode

UART0 transmit/receive control register 0 (Address 3416)

UART1 transmit/receive control register 0 (Address 3C16)

BRG count source select bits

CTS/RTS function select bit

0: CTS function selected

1: RTS function selected

0 0 : f2

0 1 : f16

1 0 : f64

1 1 : f512

b1 b0

Reception starts.

UART0 transmit buffer register (Address 3216)

UART1 transmit buffer register (Address 3A16)

Dummy data is set.

UART0 transmit/receive control register 1 (Address 3516)

UART1 transmit/receive control register 1 (Address 3D16)

Transmit enable bit

1: Transmission enabled

UART0 receive interrupt control register (Address 7216)

UART1 receive interrupt control register (Address 7416)

Interrupt priority level select bits

When using interrupts, set these bits to

one of levels 1 to 7.

When disabling interrupts, set these bits

to level 0.

CTS/RTS enable bit

0: CTS/RTS function is enabled.

1: CTS/RTS function is disabled.

CLK polarity select bit

0: At the rising edge of the transfer

clock, receive data is input.

1: At the falling edge of the transfer

clock, receive data is input.

Transfer format select bit

0: LSB first

1: MSB first

When extenal clock is selected

UART0 baud rate register (BRG0) (Address 3116)

UART1 baud rate register (BRG1) (Address 3916)

Can be set to “0016” to “FF16.”

When internal clock is selected

UARTi receive interrupt mode select bit

0: Reception interrupt

1: Reception error interrupt

Port P1 direction register (Address 516)

Pin RxD0

Pin RxD1

Reception enable bit

1: Reception enabled

Note: Set the receive enable bit

and the transmit enable

bit to “1” simultaneously.

Serial I/O pin control register (Address AC16)

CTS0/RTS0 separate select bit

0: CTS0/RTS0 are used together (Note 1).

Notes 1: In the clock synchronous serial I/O

mode, CTSi/RTSi separation cannot

be selected. (Refer to section “[Pre-

cautions for clock synchronous

serial I/O mode].”)

2: When only reception is performed, if

these bits = “1,” the TxDi pin can be

used as a programmable I/O port

pin.

CTS1/RTS1 separate select bit

0: CTS1/RTS1 are used together (Note 1).

TxD0/P13 switch bit (Note 2)

0: Functions as TxD0.

1: Functions as P13.

TxD1/P17 switch bit (Note 2)

0: Functions as TxD1.

1: Functions as P17.

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