R8C1A Datasheet, PDF (43/339 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER R8C FAMILY / R8C/1x SERIES

R8C/1A Group, R8C/1B Group
P4_2
Vref of A/D converter
Data bus
P4_5
Data bus
Pull-up selection
Direction
register
Port latch
5. Programmable I/O Ports
(Note 4)
(Note 4)
Input to individual peripheral function
Digital
filter
P4_6/XIN
Data bus
Clocked inverter⁽¹⁾
(Note 4)
P4_7/XOUT
Data bus
(Note 2)
(Note 3)
(Note 4)
Figure 5.3
NOTES:
1. When CM05 = 1, CM10 = 1, or CM13 = 0, the clocked inverter is cut off.
2. When CM10 = 1 or CM13 = 0, the feedback resistor is disconnected.
3. When CM05 = CM13 = 1 or CM10 = CM13 = 1, this pin is pulled up.
4.
symbolizes a parasitic diode.
Ensure the input voltage to each port does not exceed VCC.
Configuration of Programmable I/O Ports (3)
Rev.1.30 Dec 08, 2006 Page 27 of 315
REJ09B0252-0130