Справочник Пользователя для IBM EM78P447N

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(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 6 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: 

MOV 

A, @11111111b

; Set Port6 input 

IOW R6 

 

MOV A, 

@0xxx1010b

; Set Port6 pull-high, WDT prescaler,
prescaler must set over 1:1 

CONTW  

 

MOV 

A, @00000000b

; Enable Port6 wake-up function 

IOW RB 

 

MOV 

A, @xx00xxx1b

; Enable SLEEP2 

IOW RE 

 

After 
Wake-up 

 

 

NOP  

 

MOV 

A, @11111111b

; Disable Port6 wake-up function 

IOW RB 

 

MOV 

A, @ xx01xxx1b ; Disable WDT 

IOW RE