
12
SERIAL INTERFACE
12-34
32192/32195/32196 Group Hardware Manual
Rev.1.10 REJ09B0123-0110 Apr.06.07
Figure 12.3.2 Transmit Operation during CSIO Mode (Hardware Processing)
The following processing is
automatically performed in hardware.
Transfer the content of the transmit
buffer to the transmit shift register
Set the transmit buffer empty bit to "1"
Transmit data
Yes (Successive transmission)
Transmit
conditions met?
Transmit
conditions met?
Yes
No
Clear the transmit status bit to "0"
Transmit DMA transfer request
Transmit interrupt request
(Note 1)
CSIO transmit
operation starts
End of CSIO
transmit operation
Note 1: This applies when the transmit interrupt request was enabled using the SIO Interrupt Request Mask Register
after selecting the transmit buffer empty interrupt with the SIO Interrupt Request Source Select Register.
12.3 Transmit Operation in CSIO Mode