Fig. 8.3 Block Diagram Of Pins Of Port 3 - Fujitsu MB90420/5 (A) Series Hardware Manual

n Block diagram of pins of port 3
Figure 8.3 shows the block diagram of the pins of port 3.
PDR (port data register)
PDR read
PDR write
DDR (port direction register)
DDR write
DDR read
n Registers for port 3
The registers for port 3 are PDR3 and DDR3. The bits composing each register's bits correspond to the pins
of port 3 1-to-1. Table 8-12 shows the correspondence between the registers and the pins of port 3.
Table 8-12 Correspondence between Registers and Pins for Port 3
Port Name
PDR3, DDR3
Port 3
Corresponding pin
Output latch
Direction latch

Fig. 8.3 Block Diagram of Pins of Port 3

Bits of Related Registers and Corresponding Pins
bit 15 bit 14
P37
I/O PORT
Resource output
Standby control (SPL = 1)
bit 13 bit 12
P36 — —
8-17
Resource output enable
bit 11 bit 10 bit 9
— —
Pin
bit 8
— —