TMP93CS32F datasheet(125/180 Pages) TOSHIBA

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TMP93CS32

2004-02-10

93CS32-123

Handshake Function

The serial channels use the CTS0 pin to transmit data in units of frames, thus

preventing an overrun error. Use SC0MOD<CTSE0> to enable or disable the

handshake function.

When CTS0 goes high, data transmission is halted after the completion of the

current transmission and is not restarted until CTS0 returns to low. An INTTX0

interrupt is generated to request the CPU for the next data to transmit. When the

CPU write the data to the transmit buffer, processing enters standby mode.

An RTS pin is not provided, but a handshake function can easily be configured if

the receiver sets any port assigned to the RTS function to high (in the receive

interrupt routine) after data receive, and requests the transmitter to temporarily

halt transmission.

Figure 3.9.13 Handshake Function

Note 1:

If the CTS signal rises during transmission, the next data is not sent after the completion of the current

transmission.

Note 2:

Transmission starts at the first TXDCLK clock fall after the CTS signal falls.

Figure 3.9.14 Timing of CTS (Clear to send)

TXD

CTS

RXD

RTS

(any port)

TMP93CS32

Sender

Receiver

SIOCLK

Start bit

Bit0

(1)

(2)

Send is suspended

from (1) to (2).

Timing to write

transmission buffer

CTS0

TXDCLK

TXD

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