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8.3
Port 2
8.3.1
Overview
Port 2 is an 8-bit I/O port. Port 2 pins also function as TPU I/O pins (TIOCA3, TIOCB3, TIOCC3,
TIOCD3, TIOCA4, TIOCB4, TIOCA5, and TIOCB5), and 8-bit timer I/O pins (TMRI0, TMCI0,
TMO0, TMRI1, TMCI1, and TMO1). Port 2 pin functions are the same in all operating modes.
Port 2 uses Schmitt-triggered input.
Figure 8-2 shows the port 2 pin configuration.
8.3.2
Register Configuration
Table 8-4 shows the port 2 register configuration.
Table 8-4
Port 2 Registers
Name
Port 2 data direction register
Port 2 data register
Port 2 register
Note: * Lower 16 bits of the address.
Rev. 5.00, 12/03, page 232 of 1088
Port 2 pins
P27 (I/O)/TIOCB5 (I/O)/TMO1 (output)
P26 (I/O)/TIOCA5 (I/O)/TMO0 (output)
P25 (I/O)/TIOCB4 (I/O)/TMCI1 (input)
P24 (I/O)/TIOCA4 (I/O)/TMRI1 (input)
Port 2
P23 (I/O)/TIOCD3 (I/O)/TMCI0 (input)
P22 (I/O)/TIOCC3 (I/O)/TMRI0 (input)
P21 (I/O)/TIOCB3 (I/O)
P20 (I/O)/TIOCA3 (I/O)
Figure 8-2 Port 2 Pin Functions
Abbreviation
P2DDR
P2DR
PORT2
R/W
Initial Value
W
H'00
R/W
H'00
R
Undefined
Address *
H'FEB1
H'FF61
H'FF51
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