R8C/20 Group, R8C/21 Group 7. Programmable I/O Ports
Rev.2.00 Aug 27, 2008 Page 58 of 458
REJ09B0250-0200
NOTE:
1. Pulled up by setting the PU10 bit in the PUR0 register to 1.
NOTE:
1. Pulled up by setting the PU11 bit in the PUR0 register to 1.
X: 0 or 1
NOTE:
1. Pulled up by setting the PU11 bit in the PUR0 register to 1.
X: 0 or 1
X: 0 or 1
Table 7.35 Port P4_3
Register PD4
Function
Bit PD4_3
Setting
value
0
Input port
(1)
1 Output port
Table 7.36 Port P4_4
Register PD4
Function
Bit PD4_4
Setting
value
0
Input port
(1)
1 Output port
Table 7.37 Port P4_5/INT0
Register PD4 INTEN
Function
Bit PD4_5 INT0EN
Setting
value
0X
Input port
(1)
1 X Output port
01
INT0
input
Table 7.38 Port P4_6/XIN
Register CM1 CM0 Circuit specifications
Function
Bit CM13 CM10 CM05
Oscillation
buffer
Feedback
resistor
Setting
value
0 X X OFF OFF Input port
1 0 0 ON ON XIN-XOUT oscillation
1 0 1 OFF ON External XIN input
1 1 0 OFF OFF XIN-XOUT oscillation stop
1 1 1 OFF OFF XIN-XOUT oscillation stop
Table 7.39 Port P4_7/XOUT
Register CM1 CM0 Circuit specifications
Function
Bit CM13 CM10 CM05
Oscillation
buffer
Feedback
resistor
Setting
value
0 X X OFF OFF Input port
1 0 0 ON ON XIN-XOUT oscillation
1 0 1 OFF ON XOUT is “H” pull-up
1 1 0 OFF OFF XIN-XOUT oscillation stop
1 1 1 OFF OFF XIN-XOUT oscillation stop
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