Renesas 6NM User Manual

Rev.1.10    Jul 01, 2005    page 175 of 318
REJ09B0124-0110

M16C/6N Group (M16C/6NK, M16C/6NM)

14. Serial I/O

This document is under development and its contents are subject to change.

SI/Oi is exclusive clock-synchronous serial I/Os.

Figure 14.36 shows the block diagram of SI/Oi, and Figures 14.37 and 14.38 show the SI/Oi-related

registers.Table 14.19 lists the specifications of SI/Oi.

NOTE:

1. 100-pin version supports SI/O3 and SI/O4.

128-pin version supports SI/O3, SI/O4, SI/O5 and SI/O6.

SiTRR register

SI/O counter i 

Synchronous

circuit

Data bus

8

SI/Oi

interrupt

request 

SMi5  LSB                  MSB

SMi2
SMi3

SMi3
SMi6

SMi1 to SMi0

SiBRG register

SMi6

i = 3 to 6 (5 and 6 are only in the 128-pin version.)
n = A value set in the SiBRG register.

1/(n+1)

1/2

CLK polarity

reversing

circuit

1/2

f1SIO

1/8

1/4

f8SIO

f32SIO

f2SIO

PCLK1=0

PCLK1=1

SMi4

Clock source select

00b

01b

10b

CLKi

SOUTi

SINi

Main clock,

PLL clock,

or on-chip oscillator clock