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Rev. 1.00, 05/04, page 102 of 544
7.1.5 Port 1 Input Pull-Up MOS
Port 1 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 7.2 summarizes the input pull-up MOS states.
Table 7.2 Input Pull-Up MOS States (Port 1)
Reset Hardware Standby Mode Software Standby ModeIn 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, P1DDR = 0, and P1PCR = 1: otherwise off.
7.2 Port 2
Port 2 is an 8-bit I/O port. Port 2 has an on-chip input pull-up MOS function that can be controlled
by software. Port 2 has the following registers.
• Port 2 data direction register (P2DDR)
• Port 2 data register (P2DR)
• Port 2 pull-up MOS control register (P2PCR)
7.2.1 Port 2 Data Direction Register (P2DDR)
P2DDR specifies input or output for the pins of port 2 on a bit-by-bit basis.
Bit Bit Name
Initial
Value R/W Description
7 P27DDR 0 W
6 P26DDR 0 W
5 P25DDR 0 W
4 P24DDR 0 W
3 P23DDR 0 W
2 P22DDR 0 W
1 P21DDR 0 W
0 P20DDR 0 W
The corresponding port 2 pins are output ports when
P2DDR bits are set to 1, and input ports when P2DDR
bits are cleared to 0.