Rainbow-electronics AT73C246 Manual do Utilizador descarregar pdf (Página 92)

11050A–PMAAC–07-Apr-10

AT73C246

Name: PMU_LED

Access: Read / Write

Address: 0x0B

Note: In case of TON_LED = 175ms, PERIOD_LED=5s and BLINK=1 selection, the LED pin is driven

according to the following diagram. During 9 clock periods (internal RC 32kHz oscillator) the pin is

driven to 0, and during 1 clock period the pin is configured as ‘input’ with an internal pull up resis-

tor to VINSYS.

Figure 13-5. LED Pin Timing Diagram for TON_LED = 175ms and PERIOD_LED=5s

76543210

TON_LED PERIOD_LED BLINK ON_LED

Table 13-19. PMU_LED (0x0B) Structure

Bit Name Description Reset value

7:5 TON_LED LED ‘ON’ time 000

4:2 PERIOD_LED LED blinking period 010

1BLINK

Blinking function ON / OFF

0: OFF

1: ON

0 ON_LED

Led ON / OFF

0: OFF

1: ON

Table 13-20. LED Blinking Function Parameters Selection Table

TON_LED LED ‘ON’ Time (ms) PERIOD_LED BLINKING PERIOD (s)

000 25 000 0.5

001 50 001 1

010 75 010 2

011 100 011 3

100 125 100 4

101 150 101 5

110 175 110 6

111 200 111 8

Internal

C 32kHz

LED Pin

9 x 32kHz clock periods

Pin forced to ‘0’

1 2 ... 87 88 89 90 91 92 93 94 95 96 97 ... 158 159

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