Renesas M16C/60 Series Hardware Manual page 195

Under development
This document is under development and its contents are subject to change.
M16C/6N5 Group
(c) Functions for Setting an S
If the S3C register's SM36 bit = 0 (external clock), the S
not transferring. Figure 1.15.38 shows the timing chart for setting an S
(Example) When "H" selected for S
Signal written to
S3TRR register
SM37 bit
SM33 bit
S (internal)
OU T3
Port output
S output
OUT3
Setting the S
initial value to "H"
(Note 2)
* This diagram applies to the case where the S3C register bits are set as follows:
SM32 = 0 (S output)
OUT3
SM35 = 0 (LSB first)
SM36 = 0 (external clock)
Note 1: If the SM36 bit = 1 (internal clock) or if the SM32 bit = 1 (S
goes to the high-impedance state.
Note 2: S can only be initialized when input on the CLK
OUT3
register's SM34 bit = 0 (transmit data output at the falling edge of the transfer clock) or in
the low state if the SM34 bit = 1 (transmit data output at the rising edge of the transfer clock).
Figure 1.15.38 S
OUT3
Rev.1.00 2003.05.30 page 181
Initial Value
OUT3
initial value
OUT3
Initial value = H (Note 1)
Port selection switching
OUT3
(I/O port S )
OUT3
OUT3
pin is in the high state if the S3C
3
's Initial Value Setting
pin output can be fixed high or low when
OUT3
Setting of the initial value of S
(S
OUT3
D0
D0
(S
OUT3
Serial transmit/reception starts
output disabled), this output
initial value and how to set it.
OUT3
OUT3
output and starting of
transmission/reception
Set the SM33 bit to "0"
pin functions as an I/O port)
Set the SM37 bit to "1"
(S initial value = H)
OUT3
Set the SM33 bit to "1"
pin functions as S output)
OUT3
"H" level is output
from the S
OUT3
Write to the S3TRR register
SI/O3
pin