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SERIAL I/O

7721 Group User’s Manual

11–19

11.3 Clock synchronous serial I/O mode

Fig. 11.3.1 Initial setting example for relevant registers when transmitting

UART0 transmit buffer register (Address 3216)

UART1 transmit buffer register (Address 3A16)

Transmit 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

(In the case of selecting the CTS function, transmission starts

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

UART0 transmit/receive control register 0 (Address 3416)

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

BRG count source select bits

0 0 : f2

0 1 : f16

1 0 : f64

1 1 : f512

b1 b0

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 “0” or “1.”

Clock synchronous serial I/O mode

!! !

UART0 transmit interrupt control register (Address 7116)

UART1 transmit interrupt control register (Address 7316)

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 baud rate register (BRG0) (Address 3116)

UART1 baud rate register (BRG1) (Address 3916)

Can be set to “0016” to “FF16.”

V Necessary only when internal clock is

selected.

Transmission starts.

CTS

/ RTS select bit

0: CTS function selected

1: RTS function selected (CTS function disabled)

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