Fig. 8.4 Block Diagram Of Pins Of Port 4 - Fujitsu MB90420/5 (A) Series Hardware Manual

MB90420/5 (A) SERIES F
n Block diagram of pins of port 4
Figure 8.4 shows the block diagram of the pins of port 4.
PDR (port data register)
PDR read
PDR write
DDR (port direction register)
DDR write
DDR read
Note: 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 DDR4 register.
n Registers for port 4
The registers for port 4 are PDR4 and DDR4. The bits composing each register correspond to the pins of
port 4 1-to-1. Table 8-16 shows the correspondence between the registers and the pins of port 4.
Table 8-16 Correspondence between Registers and Pins for Port 4
Port Name
PDR4, DDR4
Port 4
Corresponding pin
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
Output latch
Direction latch

Fig. 8.4 Block Diagram of Pins of Port 4

Bits of Related Registers and Corresponding Pins
bit 7 bit 6
P47 P46
Resource output
Resource output enable
Standby control (SPL = 1)
bit 5 bit 4
P45 P44
8-22
bit 3 bit 2 bit 1
P43 P42 P41
Pin
bit 0
P40