S3F82NB datasheet(21/361 Pages) ZILOG

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PS031601-0813

P R E L I M I N A R Y

S3F82NB

Product Specification

SMART OPTION

ISP reset vector change selection

bit:(1)

0 = OBP reset vector address

1 = Normal vector (address 0100H)

ISP reset vector address selection bits:(2)

00 = 200H(ISP area size: 256 byte)

01 = 300H(ISP area size: 512 byte)

10 = 500H(ISP area size: 1024 byte)

11 = 900H(ISP area size: 2048 byte)

Not used

ISP protection size selection bits:(4)(5)

00 = 256 bytes

01 = 512 bytes

10 = 1024 bytes

11 = 2048 bytes

ISP protection enable/disable bit:(3)

0 = Enable (not erasable by LDC)

1 = Disable (Erasable by LDC)

ROM Address: 003EH

MSB

LSB

LVR enable/disable bit

(Criteria Voltage: 2.0V)

0 = Disable LVR

1 = Enable LVR

ROM Address: 003FH

MSB

LSB

ROM Address: 003CH

MSB

LSB

Not used

ROM Address: 003DH

MSB

LSB

Not used

NOTES:

1. By setting ISP reset vector change selection bit (3E.7) to '0', user can have the available ISP area.

If ISP reset vector change selection bit (3EH.7) is '1', 3EH.6 and 3EH.5 are meaningless.

2. If ISP reset vector change selection bit (3EH.7) is '0', user must change ISP reset vector address from

0100H to some address which user want to set reset address (0200H, 0300H, 0500H or 0900H).

If the reset vector address is 0200H, the ISP area can be assigned from 0100H to 01FFH (256bytes).

If 0300H, the ISP area can be assigned from 0100H to 02FFH (512bytes). If 0500H, the ISP area can

be assigned from 0100H to 04FFH (1024bytes). If 0900H, the ISP area can be assigned from 0100H

to 08FFH (2048bytes).

3. If ISP protection enable/disable bit is '0', user can't erase or program the ISP area selected by 3EH.1

and 3EH.0 in flash memory.

4. User can select suitable ISP protection size by 3EH.1 and 3EH.0. If ISP protection enable/disable bit

(3EH.2) is '1', 3EH.1 and 3EH.0 are meaningless.

5. After selecting ISP reset vector address in selecting ISP protection size, don't select upper than ISP

area size.

These bits should be

always logic "111111b".

AVREF or P1.0/INT0 selection bit:

0 = AVREF

1 = P1.0/INT0

Figure 2-2. Smart Option

S3F82NB Datasheet(PDF) 21 Page - Zilog, Inc.

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