R8C2A Datasheet, PDF (428/609 Pages) Renesas Technology Corp – MCU

R8C/2A Group, R8C/2B Group
16. Clock Synchronous Serial Interface
16.2.4 Communication Modes and Pin Functions
Clock synchronous serial I/O with chip select switches the functions of the I/O pins in each communication
mode according to the setting of the MSS bit in the SSCRH register and bits RE and TE in the SSER register.
Table 16.4 shows the Association between Communication Modes and I/O Pins.
Table 16.4 Association between Communication Modes and I/O Pins
Communication Mode
Clock synchronous
communication mode
Bit Setting
SSUMS BIDE MSS
TE
0
Disabled 0
0
1
1
0
1
4-wire bus
1
0
communication mode
0
0
1
1
0
1
4-wire bus
1
1
(bidirectional)
communication mode⁽²⁾
0
0
1
1
0
1
RE
1
0
1
1
0
1
1
0
1
1
0
1
1
0
1
0
SSI
Input
−⁽¹⁾
Input
Input
−⁽¹⁾
Input
−⁽¹⁾
Output
Output
Input
−⁽¹⁾
Input
−⁽¹⁾
−⁽¹⁾
−⁽¹⁾
−⁽¹⁾
Pin State
SSO SSCK
−⁽¹⁾
Input
Output Input
Output Input
−⁽¹⁾
Output
Output Output
Output Output
Input Input
−⁽¹⁾
Input
Input Input
−⁽¹⁾
Output
Output Output
Output Output
Input Input
Output Input
Input Output
Output Output
NOTES:
1. This pin can be used as a programmable I/O port.
2. Do not set both bits TE and RE to 1 in 4-wire bus (bidirectional) communication mode.
SSUMS and BIDE: Bits in SSMR2 register
MSS: Bit in SSCRH register
TE and RE: Bits in SSER register
Rev.2.00 Nov 26, 2007 Page 408 of 580
REJ09B0324-0200