ELANsat Tech EM78P156N Network Card User Manual


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EM78P156N
OTP ROM
vector following wake-up. If ENI is executed before SLEP, the instruction will begin to execute from the address
008H after wake-up. If DISI is executed before SLEP, the operation will restart from the succeeding instruction
right next to SLEP after wake-up.
Only one of Cases 2 and 3 can be enabled before entering the sleep mode. That is,
[a] if Port 6 Input Status Change Interrupt is enabled before SLEP , WDT must be disabled. by
software. However, the WDT bit in the option register remains enabled. Hence, the
EM78P156N can be awakened only by Case 1 or 3.
[b] if WDT is enabled before SLEP, Port 6 Input Status Change Interrupt must be disabled. Hence,
the EM78P156N 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 EM78P156N (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
MOV A, @xxxx1110b ; Select WDT prescaler
CONTW
WDTC ; Clear WDT and prescaler
MOV A, @0xxxxxxxb ; Disable WDT
IOW RE
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 the sleep mode, WDT would enable
automatically. The WDT operation (being enabled or disabled) should be handled appropriately by software
after waking up from the sleep mode.
This specification is subject to change without prior notice. 21 07.29.2004 (V1.2)
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