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ML610471/472/473/Q471/Q472/Q473 User's Manual
Chapter 13 Port 2
13-5
13.2.4 Port 2 Mode Register (P2MOD)
Address: 0F214H
Access: R/W
Access size: 8-bit
Initial value: 00H
7 6 5 4 3 2 1 0
P2MOD
⎯ ⎯ ⎯ ⎯ ⎯ ⎯
P21MD P20MD
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value 0 0 0 0 0 0 0 0
P2MOD is a special function register (SFR) to select the primary function or the secondary function of Port 2.
[Description of Bits]
•
P21MD (bit 1)
The P21MD bit is used to select the primary function or the secondary function of the P21 pin.
P21MD
Description
0 General-purpose output port function (initial value)
1 High-speed clock (OUTCLK) output function
•
P20MD (bit 0)
The P20MD bit is used to select the primary function or the secondary function of the P20 pin.
P20MD
Description
0 General-purpose output port function (initial value)
1 Low-speed clock (LSCLK) output function
Note:
• P2 (Port 2) is an output-only pin and does not have the register to select the data direction(input or output).
• The output characteristics of the P2 pins (P20, P21) are VOL1 and VOH1 (described in "Appendix C Electrical
Characteristics") when each bit (P20MD, P21MD) of the corresponding P2MOD register is "1" and are VOL2 and
VOH2 when each bit is "0".
• In 48-pin plastic TQFP, P21 pin is not available.