SC23M28

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.0

2006.07.21

Http: www.silan.com.cn

Page 4 of 10

Figure 1 Reset and reset acknowledge

RST

CLK

I/O

1

2

3

31

32

32

31

1

2

3

RST

CLK

I/O

2. Instruction format

The chip inputs and outputs the data by I/O ports, and the RST signal will control the direction of the data;

RST=1, I/O is instruction input;

RST=0, I/O is data output.

Instruction table

Byte1

Byte2

Byte3

S0 S1 S2 S3 S4 S5

A8 A9

A0-A7

D0-D7

Operation

1 0

0 0 1 1

Input data

With bit-protect erasure or write

1 1

0 0 1 1

Input data

Without bit-protect erasure or write

0 0

0 0 1 1

Comparative data

Write protect bit with data comparison

0 0

1 1 0 0

Invalid

With bit-protect read

0 1

1 1 0 0

Address

bit

8, 9

Address

bit

0-7

Invalid

Without bit-protect read

0 1

0 0 1 1

253

Bit mask code

Write error counter

1 0

1 1 0 0

254

PSC code 1

Authentication PSC code 1

1 0

1 1 0 0

1 1

255

PSC code 2

Authentication PSC code 2

Figure 2 Command input time sequence