Elan EM78P156EL Manual page 23

3. Watchdog timer time-out.
The values of T and P, listed in Table 6 are used to check how the processor wakes up. Table 7
shows the events that may affect the status of T and P.
Table 6 The Values of RST, T and P after RESET
Power on
/RESET during Operating mode
/RESET wake-up during SLEEP mode
WDT during Operating mode
WDT wake-up during SLEEP mode
Wake-Up on pin change during SLEEP mode
*P: Previous status before reset
Table 7 The Status of T and P Being Affected by Events.
Power on
WDTC instruction
WDT time-out
SLEP instruction
Wake-Up on pin change during SLEEP mode
*P: Previous value before reset
Power-on
Reset
Voltage
Detector
WDTE
/RESET
This specification is subject to change without prior notice.
Reset Type
Event
Oscillator
WDT Timeout
WDT
Fig. 9 Block Diagram of Controller Reset
T
1
*P
1
0
0
1
T
1
1
0
1
1
VDD
D Q
CLK
CLR
Setup Time
23
EM78P156EL
OTP ROM
P
1
*P
0
*P
0
0
P
1
1
*P
0
0
CLK
RESET
2002/04/19