Manual

103
AT89C5131
4136A–USB–03/03
Programmable LED AT89C5131 have up to 4 programmable LED current sources, configured by the regis-
ter LEDCON.
Reset Value = 00h
Table 75. LEDCON Register
LEDCON (S:F1h)
LED Control Register
76543210
LED3 LED2 LED1 LED0
Bit
Number
Bit
Mnemonic Description
7:6 LED3
Port
LED0 Configuration
0 0 Standard C51 Port
0 1 2 mA current source when P3.7 is O
1 0 4 mA current source when P3.7 is O
1 1 10 mA current source when P3.7 is O
5:4 LED2
Port
LED0 Configuration
0 0 Standard C51 Port
0 1 2 mA current source when P3.6 is O
1 0 4 mA current source when P3.6 is O
1 1 10 mA current source when P3.6 is O
3:2 LED1
Port
LED0 Configuration
0 0 Standard C51 Port
0 1 2 mA current source when P3.5 is O
1 0 4 mA current source when P3.5 is O
1 1 10 mA current source when P3.5 is O
1:0 LED0
Port
LED0 Configuration
0 0 Standard C51 Port
0 1 2 mA current source when P3.3 is O
1 0 4 mA current source when P3.3 is O
1 1 10 mA current source when P3.3 is O