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EM78860

8-BIT MICRO-CONTROLLER

ELAN Microelectronics 

EM78860

8-BIT MICRO-CONTROLLER

• Bit4(Read Only)(Low battery signal) 0/1 = Battery voltage is low/Normal .

If the battery voltage is under 3.6V then sends a ‘0’ signal to RA register bit4 or a ‘1’ signal to this Bit if VDD

is over 3.8V.

• Bit5(read/Write)(Low battery detect enable)

0/1 = low battery detect DISABLE/ENABLE.

The relation between /LPD,/POVD and /LOW_BAT can see Fig6.

Vdd

s2

1 on

0 off

1 on

Vref

/POVD

/LPD

1 on

+

-

to Low bat

To rese t

s2

1 on

0 off

/LPD

Fig6. The relation between /LPD,/POVD

• Bit6(read/write)(PLL enable signal)

0/1=DISABLE/ENABLE

The relation between 32.768K and 3.679M can see Fig7.

32.768K

PLL

3.679M

/358E

1

switch

0

To system clock

Fig7. The relation between 32.768K and 3.679K .

• Bit7 IDLE: sleep mode selection bit

0/1=sleep mode/IDLE mode. This bit will decide SLEP instruction which mode to go.

These IDLE mode can be waken up by TCC clock or Watch Dog or PORT9 and run from “SLEP” next

instruction.

These SLEEP mode can be waken up by Watch Dog or PORT9 and run from address “00”.

TCC time out

SLEEP mode

RA(7,6)=(0,0)

+ SLEP

X

WDT time out RESET

Port9 wake-up RESET

IDLE mode

RA(7,6)=(1,0)

+ SLEP

Wake-up

+ Interrupt

+ Next instruction

Wake-up

+ Next instruction

Wake-up

+ Next instruction

GREEN mode

RA(7,6)=(x,0)

no SLEP

Interrupt

NORMAL mode

RA(7,6)=(x,1)

no SLEP

Interrupt

RESET

RESET

RESET

RESET

* This specification are subject to be changed without notice.

6.24.1998 7

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