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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.
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.
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.
Rev. 5.00, 12/03, page 252 of 1088
Port A
Figure 8-6 Port A Pin Functions (Modes 4 and 5)
When PADDR = 1
A19
(output)
A18
(output)
Port A
A17
(output)
A16
(output)
Figure 8-7 Port A Pin Functions (Mode 6)
A19
(output)
A18
(output)
A17
(output)
A16
(output)
When PADDR = 0
PA3
(input)
PA2
(input)
PA1
(input)
PA0
(input)
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