SC23M28

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.0

2006.07.21

Http: www.silan.com.cn

Page 6 of 10

Figure5 Time sequence of erase or write error

3.2

Read operation

1) Read with protect bit

This command will read the content of the destination address unit and the corresponding protect bit

together, 9 bits in total (Figure6). After 9 clock cycles, the address increases by 1 automatically.

2) Read without protect bit

This command will only read the content of the destination address unit

Figure6

. After 8 clock

cycles, the address increases by 1 automatically.

When RST changes from “0”to“1”, read operation stops.

Figure6 Read operation time sequence

3.3

Password authentication

The SC23M28 is only readable without PSC authentication. The content of PSC cannot be read, if you try to

read PSC, you will get “00”.

The authentication steps are as follows:

--Write one to not written error counter (EC) bit and the EC address is“1021”;

--Input the first byte data of PSC code, and the address is“1022”;

--Input the second byte data of PSC code, and the address is “1023”;

--If pass the authentication, EC can be erased.