7906 datasheet(247/531 Pages) RENESAS

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SERIAL I/O

7906 Group User’s Manual Rev.2.0

11-6

11.2 Block description

11.2.2 UARTi transmit/receive control register 0

Figure 11.2.3 shows the structure of UARTi transmit/receive control register 0.

Fig. 11.2.3 Structure of UARTi transmit/receive control register 0

UART0 transmit/receive control register (Address 3416)

UART1 transmit/receive control register (Address 3C16)

BRG count source select bits

CTS/RTS function select bit

(Note 1)

Transmit register empty flag

CTS/RTS enable bit

UARTi receive interrupt mode

select bit

CLK polarity select bit

(This bit is used in the clock

synchronous serial I/O mode.)

(Note 2)

Transfer format select bit

(This bit is used in the clock

synchronous serial I/O mode.)

(Note 2)

b7 b6 b5 b4 b3 b2 b1 b0

0 0 : Clock f2

0 1 : Clock f16

1 0 : Clock f64

1 1 : Clock f512

0 : The CTS function is selected.

1 : The RTS function is selected.

0 : Data is present in the transmit register.

(Transmission is in progress.)

1 : No data is present in the transmit register.

(Transmission is completed.)

0 : The CTS/RTS function is enabled.

1 : The CTS/RTS function is disabled.

0 : Reception interrupt

1 : Reception error interrupt

0 : At the falling edge of the transfer clock, transmit

data is output; at the rising edge of the transfer

clock, receive data is input.

When not in transferring, pin CLKi’s level is “H.”

1 : At the falling edge of the transfer clock, transmit

data is output; at the falling edge of the transfer

clock, receive data is input.

When not in transferring, pin CLKi’s level is “L.”

0 : LSB (Least Significant Bit) first

1 : MSB (Most Significant Bit) first

b1 b0

Notes 1: Valid when the CTS/RTS enable bit (bit 4) is “0” and CTSi/RTSi separate select bit (bit 0 or 1 at address AC16) is “0.”

2: Fix these bits to “0” in the UART mode or when serial I/O is disabled.

Bit name

Bit

Function

At reset

R/W

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