EM78P813

8-bit OTP Micro-controller

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* This specification is subject to change without notice.

54

2004/8/19

(V1.6)

VII.9 CODE Option Register

The controller has one CODE option register which is not part of the normal program memory. The option bits cannot be

accessed during normal program execution.

CODE Option Register1 ( Program ROM)

7

6

5

4

3

2

1

0

-

CWMODE

/DED

/PTB

Bit 0(/PTB) : Program ROM data protect bit.

0/1

protect / unprotect

When user clear this bit to 0, another person will unable read the originally program code from program ROM.

Bit 1(/DED) : enable/disable DED function.

0

enable DED function

1

disable DED function

Bit 2(CWMODE) : CAS tone (2130 Hz plus 2750 Hz ) accepted frequency range select.

0

1

CODE Option Register2 ( Data ROM)

7

6

5

4

3

2

1

0

0

0

0

0

0

0

0

/DTB

Bit 0(PTB) : Data ROM data protect bit.

0/1

protect / unprotect

When user clear this bit to 0, another person will unable read the originally program code from data ROM.

Bit 1~Bit 7 : Unused

PAD Option

/POVD(power on voltage detect) reset can be enabled/disabled by PAD Option. This POVD pad is not shown on the pin

assignment. Internally or externally connecting this pad to GND/VDD to enable/disable /POVD reset.

/POVD

2.2V /POVD reset voltage

2.2V Power on reset voltage

Sleep mode current (VDD=5V)

1

No

Yes (2.2V)

1uA

0

Yes (2.2V)

No

15uA