LAPIS Semiconductor ML610421, Руководство пользователя, Страница: 257 / 437

ML610Q421/ML610Q422/ML610421 User’s Manual
Chapter 19 Port 2
19 – 5
19.2.4 Port 2 Mode Register (P2MOD)
Address: 0F214H
Access: R/W
Access size: 8 bits
Initial value: 00H
7 6 5 4 3 2 1 0
P2MOD
    
P22MD 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]
•
P22MD (bit 2)
The P22MD bit is used to select the primary function or the secondary function of the P22 pin.
P22MD Description
0 General-purpose output port function (initial value)
1 Melody 0 (MD0) output function
•
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 output 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:
The output characteristics of port2(P20, P21 and P22) corresponds to VOL1 and VOH1 when each bit
(P20MD, P21MD, P22MD) is “1” , and corresponds to VOL2 and VOH2 when the bit is “0”, which are shown
in Appendix C, "Electrical Characteristics".