448
Appendix C I/O Port Block Diagrams
C.1
Block Diagrams of Port 1
V
CC
V
CC
V
SS
PUCR1
n
PMR1
n
PDR1
n
PCR1
n
IRQ
n–4
SBY
(low level
during reset
and in standby
mode)
Internal data bus
PDR1:
PCR1:
PMR1:
PUCR1:
n = 7 to 4
Port data register 1
Port control register 1
Port mode register 1
Port pull-up control register 1
P1
n
Figure C.1 (a) Port 1 Block Diagram (Pins P1
7
to P1
4
)