Toshiba H1 Series Data Book page 327

Handshake function
Serial Channels 0 has a
one frame; thus, Overrun errors can be avoided. The handshake functions is enabled
or disabled by the SC0MOD <CTSE> setting.
When the
transmission is halted until the
Interrupt is generated, it requests the next data send to the CPU. The next data is
written in the Transmission Buffer and data sending is halted.
Though there is no
any port assigned to be the
send data halt after data receive is completed by software in the RXD interrupt
routine.
Timing to writing to the
transmission buffer
CTS0 Send is suspended
from (1) and (2)
(1)
SIOCLK
TXDCLK
TXD
Note 1: (1) If the
current transmission.
Note 2: (2) Transmission starts on the first falling edge of the TXDCLK clock after the
CTS
pin goes High on completion of the current data send, data
CTS 0
pin, a handshake function can be easily configured by setting
RTS
RTS
TMP92CZ26A
TXD
CTS0
Sender
Figure 3.14.4 Handshake function
(2)
13 14 15 16
CTS 0 signal goes High during transmission, no more data will be sent after completion of the
Figure 3.14.5
CTS
92CZ26A-324
pin. Use of this pin allows data can be sent in units of
0
pin goes Low again. However, the INTTX0
CTS 0
function. The should be output "High" to request
RTS
TMP92CZ26A
RXD
(Any port)
RTS
Receiver
1 2 3
Start bit
(Clear to send) Timing
0
TMP92CZ26A
14 15 16 1 2
bit0
signal has fallen.
CTS 0
3