7643 datasheet(160/424 Pages) RENESAS

160 / 424 page

Rev.2.00

Aug 28, 2006

page 39 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.4 UART

Fig. 2.4.3 Structure of UART control register

UART control register

b7 b6 b5 b4 b3 b2 b1 b0

UART control register

(UCON : address 3316)

Name

Functions

At reset R W

Receive enable bit (REN)

Transmit interrupt source

select bit (TIS)

CTS function enable bit

(CTS_SEL)

Receive initialization bit

(RIN)

0 : Transmit disabled

1 : Transmit enabled

0 : Receive disabled

1 : Receive enabled

Transmit initialization bit

(TIN)

0 : No action

1 : Initializing (Note 1)

0 : No action

1 : Initializing (Note 2)

0 : CTS function disabled (Note 3)

1 : CTS function enabled

0 : Interrupt when transmit buffer has

emptied

1 : Interrupt when transmit shift operation

is completed

Transmit enable bit (TEN)

0 : RTS function disabled (Note 4)

1 : RTS function enabled

0 : Address mode disabled

1 : Address mode enabled

RTS function enable bit

(RTS_SEL)

UART address mode

enable bit (AME)

Notes 1: When setting the TIN bit to “1”, the TEN bit is set to “0” and the UART status

the TEN bit to “1” and set a data to the transmit buffer register again. The TIN bit

will be cleared to “0” one cycle later after the TIN bit has been set to “1”.

2: Setting the RIN bit to “1” suspends the receiving operation and will set all of the

REN, RBF and the receive error flags (PER, FER, OER, SER) to “0”. The RIN bit

will be cleared to “0” one cycle later after the RIN bit has been set to “1”.

3: When CTS function is disabled (CTS_SEl = “0”), P86 pin can be used as ordinary

I/O ports.

4: When RTS function is disabled (RTS_SEl = “0”), P83 pin can be used as ordinary

I/O ports.

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