SC23M28 Silan Microelectronics, SC23M28 Datasheet - Page 5

• Manufacturer Part Number: SC23M28
• Description: 8KBIT MEMORY CARD IC
• Manufacturer: Silan Microelectronics

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3. Instruction description
3.1
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
1) Erase or write with protect bit
2) Erase or write without protect bit.
3) Write protect bit with data comparison
Erase/write operation
The write protect bit is active as long as you write the data, and this unit is only readable.
unit, if the contents are the same, then write “ 0” to the corresponding address unit; if the contents are
different, do nothing.
raising edge of the third clock cycle. (Figure5).
Write the data but not set the protect bit, so this unit can still be erased and written.
When the command is executed, it will compare the data and the content of the destination address
The chip can execute 3 erase and write operation:
Erase and write (Last 203 clock cycles) (Figure3);
Only Write: used for some bits of 1 byte data change from “ 1” to “ 0” (Last 103 clock cycles)(Figure4);
Only Erase: data is FF (Last 103 clock cycles) (Figure4).
If error occurs when erase or write data, I/O port will change from high level to low level at the
Figure4 Only Erase or only Write time sequence
Figure3 Erase and write time sequence
REV:1.0
SC23M28
Page 5 of 10
2006.07.21