M16C6N4 Datasheet, PDF (206/406 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

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M16C/6N Group (M16C/6N4)
15. Serial Interface
15.2 SI/O3
SI/O3 is exclusive clock-synchronous serial I/Os.
Figure 15.36 shows the block diagram of SI/O3, and Figure 15.37 shows the SI/O3-related registers. Table
15.19 lists the specifications of SI/O3.
Main clock,
PLL clock,
or on-chip oscillator clock
CLK3
SOUT3
f2SIO PCLK1=0
1/2
f1SIO
PCLK1=1
1/8
1/4
SM34
CLK polarity
reversing
circuit
SM33
SM36
Clock source select
SM31 to SM30
00b
f8SIO
01b
f32SIO
10b
Data bus
Synchronous
circuit
SM36
1/2 1/(n+1)
S3BRG register
SI/O counter 3
SI/O3
interrupt
request
SM32
SM33
SM35 LSB
MSB
SIN3
n = A value set in the S3BRG register.
S3TRR register
8
Figure 15.36 SI/O3 Block Diagram
Rev.2.30 Oct 24, 2005 page 188 of 376
REJ09B0009-0230