![](http://datasheet.mmic.net.cn/30000/M32176F3TFP_datasheet_2359466/M32176F3TFP_409.png)
12
12-11
Serial I/O
12.2 Serial I/O Related Registers
32176 Group User’s Manual (Rev.1.01)
SIO03 Interrupt Request Source Select Register (SI03SEL)
<Address: H’0080 0102>
<Upon exiting reset: H’00>
b
Bit Name
Function
R
W
0
IST0
0: Transmit buffer empty interrupt
R
W
SIO0 transmit interrupt request source select bit
1: Transmission finished interrupt
1
IST1
0: Transmit buffer empty interrupt
R
W
SIO1 transmit interrupt request source select bit
1: Transmission finished interrupt
2
IST2
0: Transmit buffer empty interrupt
R
W
SIO2 transmit interrupt request source select bit
1: Transmission finished interrupt
3
IST3
0: Transmit buffer empty interrupt
R
W
SIO3 transmit interrupt request source select bit
1: Transmission finished interrupt
4
ISR0
0: Reception finished interrupt
R
W
SIO0 receive interrupt request source select bit
1: Receive error interrupt
5
ISR1
0: Reception finished interrupt
R
W
SIO1 receive interrupt request source select bit
1: Receive error interrupt
6
ISR2
0: Reception finished interrupt
R
W
SIO2 receive interrupt request source select bit
1: Receive error interrupt
7
ISR3
0: Reception finished interrupt
R
W
SIO3 receive interrupt request source select bit
1: Receive error interrupt
The register selects the source of interrupt requests generated by each SIO when transmit or receive operation
is completed.
(1) SIOn transmit interrupt source select bit
[When set to "0"]
The transmit buffer empty interrupt is selected. A transmit buffer empty interrupt request is generated
when data is transferred from the transmit buffer register to the transmit shift register. Also, a transmit
buffer empty interrupt request is generated when the TEN (Transmit Enable) bit is set to "1" (interrupt
enabled).
[When set to "1"]
The transmission finished (transmit shift buffer empty) interrupt is selected. A transmission finished
interrupt request is generated when all of the data in the transmit shift register has been transferred.
Note: Do not select the transmission finished interrupt when an external clock is selected in CSIO
mode.
(2) SIOn receive interrupt request source select bit
[When set to "0"]
The reception finished (receive buffer full) interrupt is selected. A reception finished interrupt request is
also generated when a receive error (except overrun error) occurs.
[When set to "1"]
The receive error interrupt is selected. Following types of errors constitute a receive error:
CSIO mode: Overrun error
UART mode: Overrun, parity and framing errors
b0
123456
b7
IST0
IST1
IST2
IST3
ISR0
ISR1
ISR2
ISR3
0000000
0