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EM78P156N
OTP ROM
1. A power-on condition,
2. A high-low-high pulse on /RESET pin, and
3. Watchdog timer time-out.
The values of T and P, listed in Table 4 are used to check how the processor wakes up. Table 5 shows the
events that may affect the status of T and P.
Table 6 The Values of RST, T and P after RESET
Reset Type T P
Power on 1 1
/RESET during Operating mode *P *P
/RESET wake-up during SLEEP mode 1 0
WDT during Operating mode 0 *P
WDT wake-up during SLEEP mode 0 0
Wake-Up on pin change during SLEEP mode 1 0
*P: Previous status before reset
Table 7 The Status of T and P Being Affected by Events.
Event T P
Power on 1 1
WDTC instruction 1 1
WDT time-out 0 *P
SLEP instruction 1 0
Wake-Up on pin change during SLEEP mode 1 0
*P: Previous value before reset
Voltage
Detector
Power-on
Reset
WDTE
Setup Time
VDD
DQ
CLK
CLR
CLK
RESET
WDT Timeout
WDT
/RESET
Oscillator
Fig. 9 Block Diagram of Controller Reset
This specification is subject to change without prior notice. 24 07.29.2004 (V1.2)
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