12
12-29
Serial I/O
12.3 Transmit Operation in CSIO Mode
32180 Group User's Manual (Rev.1.0)
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
Y (Successive transmission)
Transmit
conditions met?
Transmit
conditions met?
Y
N
N
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 Enable Register
after selecting the transmit buffer empty interrupt with the SIO Interrupt Request Source Select Register.
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