Rev. 5.00, 12/03, page 253 of 1088
PA3
PA2
PA1
PA0
(I/O)
(I/O)
(I/O)
(I/O)
Port A
Figure 8-8 Port A Pin Functions (Mode 7)
Note: * Modes 6 and 7 are not available in the ROMless versions.
8.6.4
MOS Input Pull-Up Function
Port A has a built-in MOS input pull-up function that can be controlled by software. This MOS
input pull-up function can be used in modes 6 and 7*, and cannot be used in modes 4 and 5. MOS
input pull-up can be specified as on or off on an individual bit basis.
When PADDR bits are cleared to 0, setting the corresponding PAPCR bits to 1 turns on the MOS
input pull-up for that pins.
The MOS input pull-up function is in the off state after a reset, and in hardware standby mode.
The prior state is retained after in software standby mode.
Table 8-10 summarizes the MOS input pull-up states.
Table 8-10 MOS Input Pull-Up States (Port A)
Modes
Reset
Hardware Standby
Mode
Software Standby
Mode
In Other
Operations
6, 7
*
PA3 to PA0 OFF
OFF
ON/OFF
ON/OFF
4, 5
PA3 to PA0
OFF
OFF
Legend:
OFF:
MOS input pull-up is always off.
ON/OFF: On when PADDR = 0 and PAPCR = 1; otherwise off.
Note:
*
Modes 6 and 7 are not available in the ROMless versions.
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