89C5121-SK1 Atmel, 89C5121-SK1 Datasheet - Page 57

• Manufacturer Part Number: 89C5121-SK1
• Description: KIT SMART CARD FOR AT89C5121
• Manufacturer: Atmel
• Type: Smart Cardr

Specifications of 89C5121-SK1

• Contents: Board
• For Use With/related Products: AT89C5121
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: T89C5121-SK1; T89C5121-SK1

LED Ports
Configuration
Registers Definition
4164G–SCR–07/06
The current source of the LED Ports can be adjusted to 3 different values: 2, 4 or 10 mA.
The LED output is an alternate function of P3.6 an P3.7 and cannot be used while the
alternate card function is used.
The control register LEDCON is detailed below.
Table 40. LEDCON Register
Reset Value = XXXX 0000b
Number
7 - 4
3 - 2
1 - 0
Bit
7
-
Mnemonic
LED1[1,0]
LED0[1,0]
Bit
6
-
-
Description
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Port LED1 configuration:
LED1[1] LED1[0] Configuration
0
0
1
1
Port LED0 configuration:
LED0[1] LED0[0] Configuration
0
0
1
1
5
-
0
1
0
1
0
1
0
1
4
-
Standard C51 port
2 mA current source when P3.7 is at Low Level
4 mA current source when P3.7 is at Low Level
10 mA current source when P3.7 is at Low Level
standard C51 port
2 mA current source when P3.6 is at Low Level
4 mA current source when P3.6 is at Low Level
10 mA current source when P3.6 is at Low Level
LED1[1]
3
LED1[0]
2
A/T8xC5121
LED0[1]
1
LED0[0]
0
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