O3 And Si/O4 - Renesas M16C/29 Series Hardware Manual

M16C/29 Group
14.2 SI/O3 and SI/O4
SI/O3 and SI/O4 are exclusive clock-synchronous serial I/Os.
Figure 14.2.1 shows the block diagram of SI/O3 and SI/O4, and Figure 14.2.2 shows the SI/O3 and SI/O4-
related registers.
Table 14.2.1 shows the specifications of SI/O3 and SI/O4.
Main clock,
PLL clock,
or on-chip oscillator
clock
CLK
i
S
OUTi
S
INi
Figure 14.2.1. SI/O3 and SI/O4 Block Diagram
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
f PCLK0=0
2
1/2 1/2
f
1
PCLK0=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 209 of 402
Clock source select
SMi1 to SMi0
00
2
01
2
f
8
10
2
f
32
Synchronous
1/2
circuit
SiBRG register
SMi6
SI/O counter i
MSB
SiTRR register
14.2 SI/O 3 and SI/O 4
Data bus
1/(n+1)
SI/Oi
interrupt request
8