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Rev. 1.00, 05/04, page 104 of 544
7.2.5 Port 2 Input Pull-Up MOS
Port 2 has an on-chip input pull-up MOS function that can be controlled by software. This input
pull-up MOS function can be specified as on or off on a bit-by-bit basis.
Table 7.3 summarizes the input pull-up MOS states.
Table 7.3 Input Pull-Up MOS States (Port 2)
Reset
Hardware
Standby Mode
Software
Standby Mode
In Other
Operations
Off Off On/Off On/Off
[Legend]
Off: Input pull-up MOS is always off.
On/Off: On when the pin is in the input state, P2DDR = 0, and P2PCR = 1; otherwise off.
7.3 Port 3
Port 3 is an 8-bit I/O port. Port 3 pins also function as LPC input/output pins. Port 3 has the
following registers.
• Port 3 data direction register (P3DDR)
• Port 3 data register (P3DR)
• Port 3 pull-up MOS control register (P3PCR)
7.3.1 Port 3 Data Direction Register (P3DDR)
P3DDR specifies input or output for the pins of port 3 on a bit-by-bit basis.
Bit Bit Name
Initial
Value R/W Description
7 P37DDR 0 W
6 P36DDR 0 W
5 P35DDR 0 W
4 P34DDR 0 W
3 P33DDR 0 W
2 P32DDR 0 W
1 P31DDR 0 W
0 P30DDR 0 W
The corresponding port 3 pins are output ports when
P3DDR bits are set to 1, and input ports when P3DDR
bits are cleared to 0.