TMPM330 - Keil

SCLK input mode
Under development
TMPM330 (rev 0.4) 9-39
TMPM330
In the SCLK input mode, if SC0MOD2 is set to “0” and the transmit double
buffers are disabled, 8-bit data that has been written in the transmit buffer is output
from the TXD0 pin when the SCLK0 input becomes active. When all 8 bits are sent, the
INTTX0 interrupt is generated. The next transmit data must be written before the
timing point “A” as shown in Fig. 9-11.
If SC0MOD2 is set to “1” and the transmit double buffers are enabled, data is
moved from Transmit Buffer 2 to Transmit Buffer 1 when the CPU writes data to
Transmit Buffer 2 before the SCLK0 becomes active or when data transmission from
Transmit Buffer 1 (shift register) is completed. As data is moved from Transmit Buffer 2
to Transmit Buffer 1, the transmit buffer empty flag SC0MOD2 is set to “1”
and the INTTX0 interrupt is generated. If the SCLK0 input becomes active while no
data is in Transmit Buffer 2, although the internal bit counter is started, an under-run
error occurs and 8-bit dummy data (FFh) is sent.
Serial Channel (SIO)