Rainbow Electronics AT73C246 - Manual (Page 92)

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
7 6 5 4 3 2 1 0
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
1 BLINK
Blinking function ON / OFF
0: OFF
1: ON
0
0 ON_LED
Led ON / OFF
0: OFF
1: ON
0
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
RC 32kHz
LED Pin
9 x 32kHz clock periods
Pin forced to ‘0’