28
11050A–PMAAC–07-Apr-10
AT73C246
11.3.6 WAKEUP EVENTS
WAKEUP EVENTS are validated if one of the listed condition is true:
• WAKEUP0 pin goes from low to high state and WAKEUP0 bit is set to ‘1’ (see Table 11-1) in
register 0x01 (PMU_WAKEUP_EVENTS).
• WAKEUP1 pin goes from low to high state and WAKEUP1 bit is set to ‘1’ (see Table 11-1) in
register 0x01 (PMU_WAKEUP_EVENTS).
• WAKEUP2 pin goes from low to high state and WAKEUP2 bit is set to ‘1’ (see Table 11-1) in
register 0x01 (PMU_WAKEUP_EVENTS).
• WAKEUP3 pin goes from low to high state and WAKEUP3 bit is set to ‘1’ (see Table 11-1) in
register 0x01 (PMU_WAKEUP_EVENTS).
• PWREN pin goes from low to high state and high state is held for more than 10ms (see Table
11-1) and PWREN bit is set to ‘1’ in register 0x01 (PMU_WAKEUP_EVENTS).
• An RTC alarm occurs and RTC bit is set to ‘1’ in register 0x01 (PMU_WAKEUP_EVENTS).
Notes: 1. WAKEUP0 and PWREN pins must be driven with V
BACKUP
level, WAKEUP{1,2,3} pins must be
driven with V
PAD
level.
2. If any WAKEUP EVENT is triggered while AT73C246 is going from RUN to STANDBY state,
STANDBY state is then first reached before WAKEUP EVENT is taken into account.
11.3.7 HRST EVENT
HRST EVENT is validated if the following condition is true:
• HRST pin goes from low to high state and high state is held for more than 1s (see Table 11-
1).
11.3.8 HRST RUN EVENTS
HRST RUN EVENTS are validated if all these listed conditions are true:
• HRST pin is at low level for more than 10ms (see Table 11-1).
•V
INSYS
> 3.1V
• AT73C246 internal junction temperature Tj < 110°C
Note: In case of 110°C < Tj < 130°C, HRST state is maintained. The self cooling down of the die will lead
to Tj < 110°C, thus exit of HRST state.
11.3.9 HRST POWERDOWN EVENTS
HRST POWERDOWN EVENTS are validated if all of these listed conditions are true:
• HRST pin is at low level for more than 10ms.
•V
INSYS
< 3.1V or AT73C246 internal junction temperature Tj >130°C
Table 11-1. EVENTS Timing Table
Pin Parameter Comments Min Typ Max Units
PWREN Pin at V
BACKUP
Level. Debouncing Time. Pin used as POWER-ON event 95 100 105 ms
PWREN Pin at V
BACKUP
Level. Debouncing Time. Pin used as POWER-OFF event 4.75 5 5.25 sec
PWREN Pin at V
BACKUP
Level. Debouncing Time. Pin used as WAKEUP event 9.5 10 10.5 ms
HRST Pin at V
BACKUP
Level. Debouncing Time. Pin used as HRST event 0.95 1 1.05 sec
HRST Pin at GND Level. Debouncing Time.
Pin used as HRST RUN event
9.5 10 10.5 ms
Pin used as HRST POWERDOWN event
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