SC23M42A SILAN [Silan Microelectronics Joint-stock], SC23M42A Datasheet - Page 8

• Manufacturer Part Number: SC23M42A
• Description: 256BYTE MEMORY CARD IC
• Manufacturer: SILAN [Silan Microelectronics Joint-stock]

7) Compare authentication data
4. Password authentication
read PSC, you will get “ 00” .
the password authentication. After the PSC authentication, I/O port will change from “ 1” to “ 0” at the raising edge
of the second clock no matter pass the authentication or not. When RST changes from “ 0” to“ 1” I/O port returns
to “ 1” . The flow chart is as follows:
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
Binary
Hex
Validate the appointed byte of PSC each time.
The SC23M42 is only readable without PSC authentication. The content of PSC cannot be read, if you try to
The authentication steps are as follows:
If the initial value of the error counter is “ 00” , the error counter cannot be written, and also cannot go through
--Write to one bit of the error counter (EC) which has not been written, and the EC address is“ 00” ;
--Input the first byte data of PSC code, and the address is“ 01”
--Input the second byte data of PSC code, and the address is “ 02”
-- Input the third byte data of PSC code, and the address is “ 03”
--If pass the authentication, EC can be erased.
B7
0
B6
0
B5
1
B4
Control
1
33H
B3
0
B2
0
B1
1
B0
1
Address
00H… 03H
Address
A7… A0
REV:1.0
Input data
Input data
D7… D0
SC23M42
Data
Page 8 of 11
2006.07.21