7721 datasheet(238/577 Pages) RENESAS

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7721 Group User’s Manual

11–35

SERIAL I/O

11.4 Clock asynchronous serial I/O (UART) mode

Fig. 11.4.3 Initial setting example for relevant registers when transmitting

UART0 baud rate register (BRG0) (Address 3116)

UART1 baud rate register (BRG1) (Address 3916

Can be set to 0016 to FF16.

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.

UART0 transmit interrupt control register (Address 7116)

UART1 transmit interrupt control register (Address 7316)

UART0 transmit/receive control register 1 (Address 3516)

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

Transmit enable bit

1: Transmission enabled

Transmission starts.

UART0 transmit buffer register (Addresses 3316, 3216)

UART1 transmit buffer register (Addresses 3B16, 3A16)

Set transmit data here.

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 disabled

1: Parity enabled

Sleep select bit

0: Sleep mode terminated (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 select bit

0: CTS function selected

1: RTS function selected (CTS

function disabled)

0 0: f2

0 1: f16

1 0: f64

1 1: f512

b1 b0

(In the case of selecting the CTS function, transmission

starts when the CTSi pin’s input level is “L.”)

b15

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