Datasheet

Appendix C I/O Port Block Diagrams
Rev.6.00 Sep. 27, 2007 Page 1241 of 1268
REJ09B0220-0600
R
PA4PCR
C
QD
Reset
WPCRA
Reset
WDRA
R
C
QD
PA
4
RDRA
RODRA
RPORA
Internal address bus
PA4DR
Reset
WDDRA
R
C
QD
PA4DDR
Reset
WODRA
RPCRA
R
C
QD
PA4ODR
*1
*2
Mode 7
Modes 4 to 6
Modes 4 and 5
Modes 6 and 7
IRQ4 interrupt
input
IRQPAS
Legend:
WDDRA: Write to PADDR
WDRA: Write to PADR
WODRA: Write to PAODR
WPCRA: Write to PAPCR
RDRA: Read PADR
RPORA: Read port A
RODRA: Read PAODR
RPCRA: Read PAPCR
A20E: Address 20 enable
IRQPAS: IRQ port switching select
Internal data bus
A20E
Notes: 1. Output enable signal
2. Open drain control signal
Figure C.7 (b) Port A Block Diagram (Pin PA
4
)