EM78P447SAM datasheet(19/55 Pages) EMC

19 / 55 page

EM78P447S

OTP ROM

(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

SLEEP2

SLEEP1

(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

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

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

MOV

A, @xx00xxx1b ; Enable SLEEP2

IOW

After Wake-up

NOP

MOV

A, @11111111b ; Disable Port6 wake-up function

IOW

MOV

A, @ xx01xxx1b ; Disable WDT

IOW

Note:

After waking up from the SLEEP2 mode, WDT is automatically enabled. The WDT enabled/disabled

operation after waking up from SLEEP2 mode should be appropriately defined in the software.

To avoid reset from occurring when the port6 status changed interrupt enters into interrupt vector or

is used to wake-up the MCU, the WDT prescaler must be set above 1:1 ratio.

This specification is subject to change without prior notice.

06.25.2003 (V1.1)

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