R8C datasheet(103/199 Pages) RENESAS

103 / 199 page

R8C/10 Group

13. Serial Interface

Rev.1.20 Jan 27, 2006

page 93 of 180

REJ09B0019-0120

UARTi transmit/receive control register 1 (i=0, 1)

SymbolAddressAfter reset

U0C100A516

0216

U1C100AD16

0216

b7b6b5b4b3b2b1b0

Bit name

Bit

symbol

Function

Transmit enable bit

Receive enable bit(1)

Receive complete flag(2)

Transmit buffer

empty flag

0 : Transmission disabled

1 : Transmission enabled

0 : Data present in UiTB register

1 : No data present in UiTB register

0 : Reception disabled

1 : Reception enabled

0 : No data present in UiRB register

1 : Data present in UiRB register

Nothing is assigned.

When write, set “0”. When read, its content is “0”.

(b7-b4)

NOTES:

1. As for the UART1, set the TXD1EN bit in the UCON register before setting this bit to reception enabled.

2. The RI bit is set to "0" when the higher byte of the UiRB register is read.

Figure 13.5 U0C1 and U1C1 Registers and UCON Register

NOTES:

1. For P37, select “0” (RxD1) for data receive, and “1” (TxD10) for data transfer.

Set the PD3_7 bit in the PD3 register to “0” (input mode) when receiving.

2. Do not set the TXD1SEL and TXD1EN bits to “1” at the same time since they function independently.

UART transmit/receive control register 2

SymbolAddressAfter reset

UCON00B016

0016

b7b6b5

b4b3b2b1b0

Bit name

Bit

symbol

Function

TXD1SEL

TXD1EN

UART0 transmit

interrupt cause select bit

UART0 continuous

receive mode enable bit

0 : Continuous receive mode disabled

1 : Continuous receive mode enable

Port TxD11 switching bit(2)

UART1 transmit

interrupt cause select bit

0 : Transmit buffer empty (Tl = 1)

1 : Transmission completed (TXEPT = 1)

0 : Transmit buffer empty (Tl = 1)

1 : Transmission completed (TXEPT = 1)

0 : RxD1

1 : TxD10

Nothing is assigned.

When write, set “0”. When read, its content is “0”.

U0IRS

U1IRS

U0RRM

TxD10/RxD1

select bit(2)

0 : I/O port P00

1 : TxD11

Must set to “0”

(b7)

(b4-b3)

Reserved bit

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