Rainbow-electronics AT89C5122 Manuel d'utilisateur télécharger pdf (Page 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

00 0 10

LED control disabled

00 1 01

01 0 00

LED mode 2 mA

01 1 01

10 0 00

LED mode 4 mA

10 1 01

11 0 00

LED mode 10 mA

11 1 01

Port Latch

Data

LEDx.0

LEDx.1

NMOS

LEDCTRL

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 212 213

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Rainbow-electronics AT89C5122 Manuel d'utilisateur Page 60