EM78P417N/418N/419N
8-Bit Microprocessor with OTP ROM
Case [c] If Comparator output status change is used to wake-up EM78P418/9N and
CMPWE bit of RE register is enabled before SLEP, WDT must be disabled by
software. Hence, the EM78P418/9N can be awaken only with Case 4.
Wake-up time is dependent on oscillator mode. Under RC mode the reset
time is 32 clocks (for oscillator stables). In High XTAL mode, reset time is
2ms and 32 clocks (for oscillator stables); and in low XTAL mode, the reset
time is 500ms.
Case [d] If AD conversion completed is used to wake-up EM78P417/8/9N and ADWE
bit of RE register is enabled before SLEP, WDT must be disabled by
software. Hence, the EM78P417/8/9N can be awaken only with Case 5. The
wake-up time is 15 TAD (ADC clock period).
If Port 6 Input Status Change Interrupt is used to wake up the EM78P417/8/9N (as in
Case b above), the following instructions must be executed before SLEP:
; Select Segment 0
BC
R3, 7
; Select WDT prescaler and Disable WDT
MOV
IOW
A, @001110xxb
IOCE0
; Clear WDT and prescaler
WDTC
; Read Port 6
MOV
R6, R6
; Enable (or disable) global interrupt
ENI (or DISI)
MOV
MOV
MOV
IOW
SLEP
A, @00000x1xb
RE
A, @00000x1xb
IOCF0
; EnablePort 6inputchange wake-up bit
; Enable Port 6 input change interrupt
; Sleep
Similarly, if the Comparator Interrupt is used to wake up the EM78P418/9N (as in Case
[c] above), the following instructions must be executed before SLEP:
; Select Segment 0
BC
R3, 7
; Select an comparator and P60 act as CO
MOV
A, @xxxxxx10b
pin
IOW
IOCA0
; Select WDT prescaler and Disable WDT
MOV
IOW
A, @001110xxb
IOCE0
; Clear WDT and prescaler
WDTC
; Enable (or disable) global interrupt
; Enable comparator output status change
wake-up bit
ENI (or DISI)
MOV
A, @000001xxb
MOV
MOV
RE
; Enable comparator output status change
A, @000001xxb
interrupt
IOW
IOCF0
; Sleep
SLEP
32 •
Product Specification (V1.0) 06.23.2005
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
