7630 datasheet(46/238 Pages) RENESAS

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1-30

7630 Group User’s Manual

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(3) Handshaking signals

When used as transmitter, the UART will recognize the clear-to-send

signal via P27/UCTS terminal for handshaking. When used as

receiver it will issue a request-to-send signal through P26/URTS pin.

Clear-to-send input

When used as a transmitter (transmit enable bit set to “1”), the UART

starts transmission after recognizing “L” level on P27/UCTS. After

started, the UART will continue to transmit regardless of the actual

level of P27/UCTS or status of the transmit enable bit.

Request-to-send output

The UART controls the P26/URTS output according to the following

conditions.

Table 7: Output control conditions

Fig. 28 Block diagram of UART

Condition

P26/URTS

Receive enable bit is set to “1”

“L”

Reception completed during receive enable

bit set to “1”

Start bit (falling edge) detected

“H”

Receive enable bit is set to “0” before recep-

tion started

Hardware reset

Receive initialization bit is set to “1”

UMOD4,3,2

1/8

1/32

1/256

UMOD2, 1

UBRG (8)

Transmit shift register (9)

Transmission

control circuit

Reception control

circuit

P25/UTXD

P27/UCTS

P26/URTS

Bit counter

UMOD7, 6

UART status register

Transmit buffer empty flag

Receive error flags

Receive buffer full interrupt request

Receive error interrupt request

P24/URXD

Transmit buffer (9)

Data bus

Transmit buffer empty interrupt request

Transmit register empty interrupt request

Receive buffer full flag

Transmit register empty flag

Receive shift register (9)

Receive buffer (9)

UART control register

“00”

“01”

“10”

“11”

SERIAL I/Os

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