7721 datasheet(477/577 Pages) RENESAS

477 / 577 page

APPENDIX

Appendix 3. Control registers

7721 Group User’s Manual

17–14

UARTi transmit buffer register

UARTi transmit/receive control register 0

Bit

8 to 0

At reset

Undefined

Functions

(b15)

(b8)

15 to 9

–

Undefined

UART0 transmit buffer register (Addresses 3316, 3216)

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

Nothing is assigned.

Transmit data is set.

Note: Use the LDM or STA instruction for writing to this register.

CTS/RTS select bit

Bit

BRG count source select bits

Bit name

At reset

Functions

0 0 : f2

0 1 : f16

1 0 : f64

1 1 : f512

UART0 transmit/receive control register 0 (Address 3416)

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

b1 b0

0 : CTS function selected

1 : RTS function selected

Transmit register empty flag

0 : Data present in transmit register

(During transmission)

1 : No data present in transmit register

(Transmission completed)

7 to 4

Nothing is assigned.

Undefined

–

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