Fig. 8.8 Block Diagram Of Pins Of Port 8 - Fujitsu MB90420/5 (A) Series Hardware Manual

MB90420/5 (A) SERIES F
n Block diagram of pins of port 8
Figure 8.8 shows the block diagram of the pins of port 8.
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 DDR8 register.
n Registers for port 8
The registers for port 8 are PDR8 and DDR8. The bit composing each register's bits correspond to the pins
of port 8 1-to-1. Table 8-32 shows the correspondence between the registers and the pins for port 8.
Table 8-32 Correspondence between Registers and Pins for Port 8
Port Name
PDR8, DDR8
Port 8
Corresponding pin
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
Output latch
Direction latch

Fig. 8.8 Block Diagram of Pins of Port 8

Bits of Related Registers and Corresponding Pins
bit 7 bit 6
P87
Resource output
Standby control (SPL = 1)
bit 5 bit 4
P86 P85 P84
8-42
Resource output enable
bit 3 bit 2 bit 1
P83 P82 P81
Pin
bit 0
P80