Rainbow Electronics AT73C246 User 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’