at89c5131 ATMEL Corporation, at89c5131 Datasheet - Page 89

• Manufacturer Part Number: at89c5131
• Description: 8-bit Flash Microcontroller With Full Speed Usb Device At89c5131
• Manufacturer: ATMEL Corporation

Programmable LED
88
AT89C5131
AT89C5131 have up to 4 programmable LED current sources, configured by the regis-
ter LEDCON.
Table 72. LEDCON Register
LEDCON (S:F1h)
LED Control Register
Reset Value = 00h
Bit
Number
7:6
5:4
3:2
1:0
7
LED3
Bit
Mnemonic
LED3
LED2
LED1
LED0
6
Description
Port/LED3 Configuration
0
0
1
1
Port/LED2 Configuration
0
0
1
1
Port/LED1 Configuration
0
0
1
1
Port/LED0 Configuration
0
0
1
1
5
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
LED2
Standard C51 Port
2 mA current source when P3.7 is O
4 mA current source when P3.7 is O
10 mA current source when P3.7 is O
Standard C51 Port
2 mA current source when P3.6 is O
4 mA current source when P3.6 is O
10 mA current source when P3.6 is O
Standard C51 Port
2 mA current source when P3.5 is O
4 mA current source when P3.5 is O
10 mA current source when P3.5 is O
Standard C51 Port
2 mA current source when P3.3 is O
4 mA current source when P3.3 is O
10 mA current source when P3.3 is O
4
3
LED1
2
1
4136C–USB–04/05
LED0
0