TMP93CS44 datasheet(139/224 Pages) TOSHIBA

139 / 224 page

TMP93CS44/S45

2004-02-10

93CS44-137

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)

TMP93CS44/S45

Sender

Receiver

Timing to write

Transmission buffer

SIOCLK

Start bit

Bit0

Note 1

Note 2

Send is suspended

CTS0

TXDCLK

TXD

TMP93CS44 데이터시트(PDF) 139 Page - Toshiba Semiconductor