Fig. 8.1 Block Diagram Of Pins Of Port 0 - Fujitsu MB90420/5 (A) Series Hardware Manual

n Block diagram of pins of port 0
Figure 8.1 shows the block diagram of the pins of port 0.
PDR (port data register)
PDR read
PDR write
DDR (port direction register)
DDR write
DDR read
n Registers for port 0
The registers for port 0 are PDR0 and DDR0. the bits composing each register's bits correspond to the pins
of port 0 1-to-1. Table 8-4 shows the correspondence between the registers and pins for port 0.
Table 8-4 Correspondence between Registers and Pins for Port 0
Port Name
PDR0, DDR0
Port 0
Corresponding pin
Resource input
Output latch
Direction latch

Fig. 8.1 Block Diagram of Pins of Port 0

Bits of Related Registers and Corresponding Pins
bit 7
P07
I/O PORT
Resource output
Standby control (SPL = 1)
bit 6 bit 5 bit 4
P06 P05 P04
8-7
Resource output enable
bit 3 bit 2 bit 1
P03 P02 P01
Pin
bit 0
P00