Datasheet

M16C/6S Group SI/O3 and SI/O4
R01DS0201EJ0502 Rev.5.02 page 132 of 203
Dec 25, 2012
SI/O3 and SI/O4
SI/O3 and SI/O4 are exclusive clock-synchronous serial I/Os.
Figure 1.17.1 shows the block diagram of SI/O3 and SI/O4, and Figure 1.17.2 shows the SI/O3 and SI/O4-
related registers. SI/O4 is derectly connected to IT800 internally.
Table 1.17.1 shows the specifications of SI/O3 and SI/O4.
Figure 1.17.1. SI/O3 and SI/O4 Block Diagram
Data bus
SI/Oi
interrupt request
Note: i = 3, 4.
n = A value set in the SiBRG register.
SiTRR register
SI/O counter i
8
SMi5 LSB MSB
SMi2
SMi3
SMi3
SMi6
SMi1 to SMi0
CLK
i
S OUTi
S INi
SiBRG register
SMi6
1/(n+1)
1/2
1/2
Main clock,
or On-chip Oscillator clock
f
1SIO
1/2
1/8
1/4
f8SIO
f32SIO
f2SIO PCLK1=0
PCLK1=1
SMi4
002
012
102
Clock source select
Synchronous
circuit
CLK
polarity
reversing
circuit