Rev. 5.00, 12/03, page 252 of 1088
8.6.3
Pin Functions
Modes 4 and 5: In modes 4 and 5, the lower 4 bits of port A are designated as address outputs
automatically.
Port A pin functions in modes 4 and 5 are shown in figure 8-6.
A19
A18
A17
A16
(output)
(output)
(output)
(output)
Port A
Figure 8-6 Port A Pin Functions (Modes 4 and 5)
Mode 6*: In mode 6*, port A pins function as address outputs or input ports. Input or output can
be specified on an individual bit basis. Setting PADDR bits to 1 makes the corresponding port A
pins address outputs, while clearing the bits to 0 makes the pins input ports.
Port A pin functions in mode 6 are shown in figure 8-7.
A19
A18
A17
A16
PA3
PA2
PA1
PA0
(input)
(input)
(input)
(input)
(output)
(output)
(output)
(output)
Port A
When PADDR = 1
When PADDR = 0
Figure 8-7 Port A Pin Functions (Mode 6)
Mode 7*: In mode 7*, port A pins function as I/O ports. Input or output can be specified for each
pin on an individual bit basis. Setting PADDR bits to 1 makes the corresponding port A pins
output ports, while clearing the bits to 0 makes the pins input ports.
Port A pin functions in mode 7 are shown in figure 8-8.
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