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EM78P447NAM Datasheet(PDF) 19 Page - ELAN Microelectronics Corp

Part No. EM78P447NAM
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Manufacturer  EMC [ELAN Microelectronics Corp]
Direct Link  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM78P447NAM Datasheet(HTML) 19 Page - ELAN Microelectronics Corp

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The above two cases will cause the controller EM78P447N to reset. The T and P flags of R3 can be
used to determine the source of the reset (wake-up).
In addition to the basic SLEEP1 MODE, EM78P447N has another sleep mode (designated as SLEEP2
MODE and is invoked by clearing the IOCE register “SLPC” bit). In the SLEEP2 MODE, the controller
can be awakened by-
(A) Any of the wake-up pins is “0” as illustrated in Figure. 5. Upon waking, the controller will continue to
execute the succeeding address. Under this case, before entering SLEEP2 MODE, the wake-up
function of the trigger sources (P60~P67 and P74~P75) should be selected (e.g., input pin) and
enabled (e.g., pull-high, wake-up control). It should be noted that after waking up, the WDT is enabled
if the Code Option bit ENWDT is “0”. The WDT operation (to be enabled or disabled) should be
appropriately controlled by software after waking up.
(B) WDT time-out (if enabled) or external reset input on /RESET pin will trigger a controller reset.
Table 4 Usage of Sleep1 and Sleep2 Mode
Usage of Sleep1 and Sleep2 Mode
(a) Before SLEEP
(a) Before SLEEP
1. Set Port6 or P74 or P75 Input
1. Execute SLEP instruction
2. Enable Pull-High and set WDT prescaler over
1:1 (Set CONT.7 and CONT.3 ~ CONT.0)
3. Enable Wake-up (Set IOCB or IOCE.0)
4. Execute Seep2 (Set IOCE.4)
(b) After Wake-up
(b) After Wake-up
1. Next instruction
1. Reset
2. Disable Wake-up
3. Disable WDT (Set IOCE.5)
If Port6 Input Status Changed Wake-up is used to wake-up the EM78P447S (Case [a] above), the
following instructions must be executed before entering SLEEP2 mode:
This specification is subject to change without prior notice.
10.21.2004 (V1.0)
A, @11111111b ; Set Port6 input
A, @0xxx1010b ; Set Port6 pull-high, WDT prescaler, prescaler must set over 1:1
A, @00000000b ; Enable Port6 wake-up function
A, @xx00xxx1b ; Enable SLEEP2
After Wake-up
A, @11111111b ; Disable Port6 wake-up function

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