Rainbow Electronics AT89C5122 - Manual (Page 60)

60
AT8xC5122/23
4202E–SCR–06/06
Figure 29. LED Source Current
Notes: 1. When switching a low level, LEDCTRL device has a permanent current of about
N mA/15 (N is 2, 4 or 8).
2. The port must be configured as standard C51 port by means of PMOD0 and PMOD1
registers and the level of current must be programmed by means of LEDCON0 and
LEDCON1 registers before switching the led on.
Table 35. LED Source Current
LEDx.1 LEDx.0 Port Latch Data NMOS PIN Comments
0 0 0 1 0
LED control disabled
0 0 1 0 1
0 1 0 0 0
LED mode 2 mA
0 1 1 0 1
1 0 0 0 0
LED mode 4 mA
1 0 1 0 1
1 1 0 0 0
LED mode 10 mA
1 1 1 0 1
Pin
Port Latch
Data
LEDx.0
LEDx.1
NMOS
N
N
LEDCTRL