Si/O3 - Renesas M16C/60 Series Hardware Manual

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M16C/6N5 Group

SI/O3

SI/O3 is exclusive clock-synchronous serial I/O.
Figure 1.15.34 shows the block diagram of SI/O3, and Figure 1.15.35 shows the SI/O3-related registers.
Table 1.15.18 lists the specifications of SI/O3.
Main clock,
PLL clock,
or ring oscillator clock
CLK
3
S
OUT3
S
IN3
n = A value set in the S3BRG register.
Figure 1.15.34 SI/O3 Block Diagram
Rev.1.00 2003.05.30 page 177
f PCLK1=0
2SIO
1/2
f
1SIO
PCLK1=1
1/8
1/4
SM33
SM34
SM36
CLK polarity
reversing
circuit
SM32
SM33
SM35 LSB
Clock source select
SM31 to SM30
00
2
01
f 2
8SIO
10
2
f
32SIO
Synchronous
1/(n+1)
1/2
circuit
S3BRG register
SM36
SI/O counter 3
MSB
S3TRR register
SI/O3
Data bus
SI/O3
interrupt
request
8