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R8C/14 Group, R8C/15 Group 15. Clock Synchronous Serial I/O with Chip Select (SSU)
Rev.2.10 Jan 19, 2006 Page 147 of 253
REJ09B0164-0210
Figure 15.7 SSMR2 Register
SS Mode Register 2
(5)
Symbol Address After Reset
SSMR2
00BDh 00h
Bit Symbol Bit Name Function RW
SCS
_
____
Pin Open Drain Output
0 : CMOS output
Select Bit
1 : NMOS open drain output
SCS
_
____
Pin Select Bit
(2)
b5 b4
0 0 : Functions as port
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. Refer to
20.6.1 Access Registers Associated with SSU
for accessing registers associated with SSU.
RW
b0
Refer to
15.2 Relationship between Data I/O Pin and SS Shift Register
for the combination of the data
The SCS
_
_____
pin functions as a port, regardless of the contents of the CSS0 and CSS1 bits w hen the SSUMS
SCKS
SSCK Pin Select Bit 0 : Functions as port
1 : Functions as serial clock pin
RW
b3 b2 b1b7 b6 b5 b4
CSS0
CSS1
SOOS
SCKOS
SSUMS
CSOS
RW
0 : Clock Synchronous Communication Mode
1 : Four-Wire Bus Communication Mode
SSCK Pin Open Drain Output
Select Bit
0 : CMOS output
1 : NMOS open drain output
SSU Mode Select Bit
(1)
SSO Pin Open Drain Output
Select Bit
(1)
0 : CMOS output
1 : NMOS open drain output
RW
RW
RW
RW
The BIDE bit is disabled when 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.
I/O pin.
bit is set to “0” (clock synchronous communication mode).
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