EM78F651NAPSSLASHNAPJ datasheet(27/58 Pages) EMC

27 / 58 page

EM78F651N

8-Bit Microcontroller

Product Specification (V1.1) 10.20.2006

• 23

(This specification is subject to change without further notice)

[b] If WDT is enabled before SLEP, Port 6 Input Status Change wake-up and External

interrupt (/INT) must be disabled. Hence, the EM78F651N, can be awakened only

by Case 1 or 2. Refer to the section on Interrupt.

If Port 6 Input Status Change Interrupt is used to wake-up the EM78F651N, (Case [a]

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

MOV A, @xx000110b ; Select internal TCC clock

CONTW

CLR R1

; Clear TCC and prescaler

WDTC

; Clear WDT and prescaler

MOV A, @0xxx1110b ; Select WDT prescaler & disable WDT

IOW RA

MOV R6, R6

; Read Port 6

MOV A, @00000x1xb ; Enable Port 6 input change interrupt

IOW RF

ENI (or DISI)

; Enable (or disable) global interrupt

SLEP

; Sleep

NOP

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

would be enabled automatically. The WDT operation (being enabled or disabled)

should be handled appropriately by software after waking up from sleep mode.

EM78F651NAPS/NAPJ 데이터시트(PDF) 27 Page - ELAN Microelectronics Corp