Renesas M32R/ECU Series User Manual page 520

12
•
Transfer the content of the transmit
•
Set the transmit buffer empty bit to "1"
Y (Successive transmission)
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.
Figure 12.3.2 Transmit Operation during CSIO Mode (Hardware Processing)
The following processing is
automatically performed in hardware.
CSIO transmit
operation starts
Transmit
conditions met?
Y
buffer to the transmit shift register
Transmit data
Transmit
conditions met?
N
Clear the transmit status bit to "0"
End of CSIO
transmit operation
12.3 Transmit Operation in CSIO Mode
N
Transmit interrupt request
Transmit DMA transfer request
12-29
Serial I/O
(Note 1)
32180 Group User's Manual (Rev.1.0)