Fig. 8.9 Block Diagram Of Pins Of Port 9 - Fujitsu MB90420/5 (A) Series Hardware Manual

n Block diagram of pins of port 9
Figure 8.9 shows the block diagram of the pins of port 9.
PDR (port data register)
PDR read
PDR write
DDR (port direction register)
DDR write
DDR read
When the output enable bit is set for a pin of the resource, the pin is forcibly set as an output pin of the
resource irrespective of the value of the DDR9 register.
n Registers for port 9
The registers for port9 are PDR9 and DDR9. The bits composing each register correspond to the pins of
port 9 1-to-1. Table 8-3 shows the correspondence between the registers and the pins for port 9.
Table 8-36 Correspondence between Registers and Pins for Port 9
Port Name
PDR9, DDR9
Port 9
Corresponding pin
I/O PORT
Output latch
Direction latch

Fig. 8.9 Block Diagram of Pins of Port 9

Bits of Related Registers and Corresponding Pins
bit 15 bit 14
— —
Resource output
Resource output enable
Standby control (SPL = 1)
bit 13 bit 12
— —
8-47
bit 11 bit 10 bit 9
— — P91
Pin
bit 8
P90