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TC9WMA2FK Arkusz danych(PDF) 3 Page - Toshiba Semiconductor

Numer części TC9WMA2FK
Szczegółowy opis  CMOS Digital Integrated Circuits Silicon Monolithic 2,048-Bit (256 횞 8 Bit) Serial E2PROM
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Producent  TOSHIBA [Toshiba Semiconductor]
Strona internetowa  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

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TC9WMA2FK
2007-10-19
3
Functional Description
1. Types of Instructions
Command
Operation
Address
C0 C1 C2 C3
Data
Read
A0~A7
1
0
0
0
0
0
0
0
Program
A0~A7
0
1
1
0
0
0
0
0
D0~D7
All erase
********
0
011
00
0
0
Busy monitor
********
1
011
00
0
0
Overwrite enable
********
1
001
00
0
0
Overwrite disable
********
1
101
00
0
0
Read Auto-incremented
A0~A7
1
0
0
0
1
0
0
0
*: Don’t care
2. Operation Method
Be sure to drive CS and CLK high temporarily before entering an instruction. After CS is asserted
low, CLK becomes effective, acting as a serial transfer synchronizing signal. The data on DI is latched on
a rising edge of CLK , while data is output to DO on a falling edge of CLK .
Instructions can only be executed when the chip is not being programmed or collectively erased (i.e.,
when the ready/busy status signal is high). However, the Monitor Busy instruction can be entered at any
time.
Only the commands listed in the above table can be used. Do not use any other command.
• Read
Entering the Read instruction causes memory data at the specified address to be read out and serially
output from the DO pin.
• Program
Entering the Program instruction causes overwrite operation to automatically start within the chip,
overwriting memory data at the specified address with the input data.
After the instruction is entered, CS can be driven high even while overwrite operation is still in
progress internally.
• All Erase
Entering the Erase All instruction causes erase operation to automatically start within the chip,
erasing memory data at all addresses.
After the instruction is entered, CS can be driven high even while erase operation is still in progress
internally.
This command clears the memory data to 0.
• Busy Monitor
Entering the Monitor Busy instruction causes a ready/busy status signal to be output from the DO pin.
This output signal is low while the chip is being programmed or collectively erased, and is high after
programming or collective erase operation is completed.
The ready/busy status signal is output continuously until CS is driven high.
• Overwrite Enable/Disable
Entering the Enable Overwrite instruction places the chip in overwrite enabled mode, where the
Program and Erase All instructions can be entered.
Entering the Disable Overwrite instruction places the chip in overwrite disabled mode, where the
Program and Erase All instructions cannot be entered.
Once the chip is placed in overwrite disabled mode, it remains disabled against overwriting until the
Enable Overwrite instruction is entered.
• Read Auto-incremented
After the data at the specified address is output, the subsequent CLK pulse causes the address to be
incremented so that the data at the next address is output automatically. After the data at the last
address is output, that at the first address will be read and output.


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