EM78P458AP datasheet(28/76 Pages) EMC

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EM78P458/459

OTP ROM

ENI (or DISI)

; Enable (or disable) global interrupt

SLEP

; Sleep

NOP

Similarly, if the Comparator High Interrupt is used to wake up the EM78P458/459 (as in Case [c]

above), the following instructions must be executed before SLEP:

MOV A, @0Bxx000110

; Select internal TCC clock

CONTW

CLR R1

; Clear TCC and prescaler

MOV A, @0Bxxxx1110

; Select WDT prescaler

CONTW

WDTC

; Clear WDT and prescaler

MOV A, @0B0xxxxxxx

; Disable WDT

IOW RE

MOV A, @0B01xxxxxx

; Enable comparator high interrupt

IOW RF

ENI (or DISI)

; Enable (or disable) global interrupt

SLEP

; Sleep

NOP

One problem user must be aware of, is that after waking up from the sleep mode, the WDT function

will enable automatically. The WDT operation (being enabled or disabled) should be handled

appropriately by software after waking up from the sleep mode.

2. The Status of T, and P of STATUS Register

A RESET condition is initiated by one of the following events:

(1) A power-on condition,

(2) A high-low-high pulse on /RESET pin, or

(3) Watchdog Timer time-out.

The values of T and P, as listed in Table 5 below, are used to check how the processor wakes up.

Table 6 shows the events, which may affect the status of T and P.

This specification is subject to change without prior notice.

06.25.2004 (V1.4)

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