Renesas R8C/20 User Manual

R8C/20 Group, R8C/21 Group 16. Clock Synchronous Serial Interface
Rev.2.00 Aug 27, 2008 Page 290 of 458
REJ09B0250-0200
Figure 16.7 SSMR2 Register
SS Mode Register 2
Symbol Address After Reset
SSMR2
00BDh 00h
Bit Symbol Bit Name Function RW
SCS
_
____
pin open drain output select
0 : CMOS output
1 : N-channel open drain output
SCS
_____
pin select bit
(2)
b5 b4
0 0 : Functions as
p
or
t
0 1 : Function as SCS
_
____
input pin
1 0 : Function as SCS
_
____
output pin
(3)
1 1 : Functions as SCS
_
____
output pin
(3)
NOTES:
1.
2.
3.
4.
5.
The BIDE bit is disabled w hen the SSUMS bit is set to 0 (clock synchronous communication mode).
RWBIDE
Bidirectional mode enable bit
(1,4)
0 : Standard mode (communicates using 2
pins of data input and data output)
1 : Bidirectional mode (communicates using
1 pin of data input and data output)
This bit functions as the SCS
_
____
input pin before starting transfer.
set to 0 (clock synchronous communication mode).
The SSI pin and SSO pin corresponding port direction bits are set to 0 (input mode) w hen the SOOS bit is set to 0
(CMOS output).
RW
RW
RW
RW
RW
RW
0 : Clock synchronous communication mode
1 : Four-w ire bus communication mode
SSCK pin open drain output
select bit
0 : CMOS output
1 : N-channel open drain output
CSS1
Clock synchronous serial I/O with
chip select mode select bit
(1)
SSO pin open drain output select
bit
(1)
0 : CMOS output
(5)
1 : N-channel open drain output
CSS0
SOOS
SCKOS
SSUMS
CSOS
b2 b1b7 b6 b5 b4 b0
Ref er to
16.2.2.1 Association between Data I/O Pins and SS Shift Register
for the combination of the data I/O
pin.
The SCS
_
_____
pin functions as a port, regardless of the contents of the CSS0 and CSS1 bits w hen the SSUMS bit is
SCKS
SSCK pin select bit 0 : Functions as port
1 : Functions as serial clock pin
RW
b3

Renesas R8C/20 Specifications

General

Brand	Renesas
Model	R8C/20
Category	Control Unit
Language	English