Si/O3 And Si/O4 - Renesas M16C FAMILY series Hardware Manual

M 1 6 C 2 / 8 G o r u p ( M 1 6 C

14.2 SI/O3 and SI/O4

Note
The SI/O4 interrupt of peripheral function interrupt is not available in the 64-pin package.
SI/O3 and SI/O4 are exclusive clock-synchronous serial I/Os.
Figure 14.35 shows the block diagram of SI/O3 and SI/O4, and Figure 14.36 shows the SI/O3 and SI/O4-
related registers.
Table 14.20 shows the specifications of SI/O3 and SI/O4.
Main clock,
f
1SIO
PLL clock,
or on-chip oscillator
clock
CLK
i
S
OUTi
S
INi
Figure 14.35 SI/O3 and SI/O4 Block Diagram
R e . v 2 0 . 0 J a . n 3 , 1 2 0 0 7
R E J 0 9 B 0 0 4 7 0 - 2 0 0
2 / , 8 M 1 6 C 2 / 8 ) B
f PCLK1=0
2SIO
1/2 1/2
PCLK1=1
1/8
1/4
SMi4 SMi3
SMi6
CLK
polarity
reversing
circuit
SMi2
SMi3
SMi5 LSB
Note: i = 3, 4.
n = A value set in the SiBRG register.
page 212
f o 3 8 5
Clock source select
SMi1 to SMi0
00
2
01
2
f
8SIO
10
2
f
32SIO
Synchronous
1/2
circuit
SiBRG register
SMi6
SI/O counter i
MSB
SiTRR register
Data bus
1/(n+1)
SI/Oi
interrupt request
8
14. Serial I/O