
184
Mitsubishi microcomputers
M16C / 62P Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Under
development
Preliminary Specifications Rev.1.0
Specifications in this manual are tentative and subject to change.
SI/O3, SI/O4
SI/O3 and SI/O4
SI/O3 and SI/O4 are exclusive clock-synchronous serial I/Os.
Figure 1.21.1 shows the block diagram of SI/O3 and SI/O4, and Figure 1.21.2 shows the SI/O3 and SI/O4-
related registers.
Table 1.21.1 shows the specifications of SI/O3 and SI/O4.
Figure 1.21.1. 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
SMi6
SMi1 to SMi0
CLKi
SOUTi
SINi
SiBRG register
SMi6
1/(n+1)
1/2
Main clock,
PLL clock,
or ring oscillator clock
f1SIO
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