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SERIAL I/O

7906 Group User’s Manual Rev.2.0

11-48

11.4 Clock asynchronous serial I/O (UART) mode

Reception will start when the start bit (’s

falling edge) is detected.

Port P1 direction register (Address 516)

Pin RxD0

Pin RxD1

UART0 baud rate register (BRG0) (Address 3116)

UART1 baud rate register (BRG1) (Address 3916)

Can be set to “0016” to “FF16.”

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.

✻ Set the same transfer data format

as that of the transmitter side.

UART0 transmit/receive control register 1 (Address 3516)

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

Receive enable bit

1: Reception enabled

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

1 0 0: UART mode (7 bits)

1 0 1: UART mode (8 bits)

1 1 0: UART mode (9 bits)

Stop bit length select bit

0: 1 stop bit

1: 2 stop bits

Odd/Even parity select bit

0: Odd parity

1: Even parity

Parity enable bit

0: Parity is disabled.

1: Parity is enabled.

Sleep select bit

0: Sleep mode cleared (invalid)

1: Sleep mode selected

b2 b1 b0

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

CTS/RTS enable bit

0: CTS/RTS function is enabled.

1: CTS/RTS function is disabled.

Notes 1: The CLKi pin cannot be used

when the CTSi/RTSi separation

is selected. (Refer to “[Precau-

tion for clock asynchronous

serial I/O (UART) mode].”)

2: When performing reception only,

if these bits are set to “1,” the

TxDi pin can be used as a

programmable I/O port pin.

UARTi receive interrupt mode select bit

0: Reception interrupt

1: Reception error interrupt

Serial I/O mode select bit

Serial I/O pin control register (Address AC16)

CTS0/RTS0 separate select bit

0: CTS0/RTS0 are used together.

1: CTS0/RTS0 are separated (Note 1).

CTS1/RTS1 separate select bit

0: CTS1/RTS1 are used together.

1: CTS1/RTS1 are separated (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.

Fig. 11.4.10 Initial setting example for relevant registers when receiving

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