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M16C/62P Group (M16C/62P, M16C/62PT)
17.2 SI/O3 and SI/O4
Note
The M16C/62P (80-pin version) and M16C/62PT (80-pin version) do not include SIN3 pin of SI/O3.
SI/O3 is only for transmission. Reception is impossible.
SI/O3 and SI/O4 are exclusive clock-synchronous serial I/Os.
Figure 17.34 shows the block diagram of SI/O3 and SI/O4, and Figure 17.35 shows the SI/O3 and SI/O4-
related registers.
Table 17.20 shows the specifications of SI/O3 and SI/O4.
Main clock,
PLL clock,
or on-chip oscillator clock
CLK
i
SOUTi
SINi
Figure 17.34 SI/O3 and SI/O4 Block Diagram
R
e
. v
2
3 .
0
S
e
p
0
, 1
2
0
0
4
R
E
J
0
9
B
0
1
8
5
0 -
2
3
0
Z
f2SIO PCLK1=0
1/2
1/2
f1SIO
PCLK1=1
1/8
1/4
SMi3
SMi4
SMi6
CLK
polarity
reversing
circuit
SMi2
SMi3
NOTES :
1. i = 3, 4.
n = A value set in the SiBRG register.
page 202
f o
3
6
4
Clock source select
SMi1 to SMi0
00b
01b
f8SIO
10b
f32SIO
Synchronous
1/2
circuit
SMi6
SI/O counter i
SMi5 LSB
MSB
SiTRR register
Data bus
1/(n+1)
SiBRG register
SI/Oi
interrupt request
8
17. Serial I/O
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