EM78P156EL Просмотр технического описания (PDF) - Elan Microelectronics Corp

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EM78P156EL

8-BIT MICRO-CONTROLLER

Elan Microelectronics Corp 

EM78P156EL

OTP ROM

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

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

Power-on

Reset

Voltage

Detector

WDTE

Oscillator

VDD

D

Q

CLK

CLR

CLK

/RESET

WDT

WDT Timeout

Setup Time

RESET

Fig. 9 Block Diagram of Controller Reset

This specification is subject to change without prior notice.

24

07.29.2004 (V1.3)

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