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If a Group A mode is in progress (not fully completed), then another mode in Group A
should not be started. However, during this time in which a Group A mode is in
progress, modes in Group B can be started, except the first two Group A commands
(Memory Array Read Commands).
This gives the DataFlash the ability to virtually accommodate a continuous data stream.
While data is being programmed into main memory from buffer 1, data can be loaded
into buffer 2 (or vice versa). See application note AN-4 ( “Using Atmel ’s Serial
DataFlash”) for more details.
Pin Descriptions
SERIAL/8-BIT INTERFACE CONTROL (SER/BYTE): The DataFlash may be config-
ured to utilize either its serial port or 8-bit port through the use of the serial/8-bit control
pin (SER/BYTE). When the SER/BYTE pin is held high, the serial port (SI and SO) of
the DataFlash will be used for all data transfers, and the 8-bit port (I/O7 - I/O0) will be in
a high impedance state. Any data presented on the 8-bit port while SER/BYTE is held
high will be ignored. When the SER/BYTE is held low, the 8-bit port will be used for all
data transfers, and the SO pin of the serial port will be in a high impedance state. While
SER/BYTE is low, any data presented on the SI pin will be ignored. Switching between
the serial port and 8-bit port should only be done while the CS pin is high and the device
is not busy in an internally self-timed operation.
The SER/BYTE pin is internally pulled high; therefore, if the 8-bit port is never to be
used, then connection of the SER/BYTE p in is not necessary. In addition, if the
SER/BYTE pin is not connected or if the SER/BYTE pin is always driven high externally,
then the 8-bit input/output pins (I/O7-I/O0), the VCCP pin, and the GNDP pin should be
treated as “don’t connects”.
SERIAL INPUT (SI): The SI pin is an input-only pin and is used to shift data serially into
the device. The SI pin is used for all data input, including opcodes and address
sequences. If the SER/BYTE pin is always driven low, then the SI pin should be a “don’t
connect”.
SERIAL OUTPUT (SO): The SO pin is an output-only pin and is used to shift data seri-
ally out from the device. If the SER/BYTE pin is always driven low, then the SO pin
should be a “don’t connect”.
8-BIT INPUT/OUTPUT (I/O7-I/O0): The I/O7-I/O0 pins are bidirectional and used to
clock data into and out of the device. The I/O7-I/O0 pins are used for all data input,
including opcodes and address sequences. The use of these pins is optional, and the
pins s hould be treated as “don’t connects” if the SER/BYTE pin is not connected or if the
SER/BYTE pin is always driven high externally.
SERIAL CLOCK/CLOCK (SCK/CLK): The SCK and CLK pins are input-only pins and
are used to control the flow of data to and from the DataFlash. The SCK and CLK pins
are used for serial and 8-bit interface respectively. Data is always clocked into the
device on the rising edge of SCK/CLK and clocked out of the device on the falling edge
of SCK/CLK.
CHIP SELECT (CS): The DataFlash is selected when the CS pin is low. When the
device is not selected, data will not be accepted on the input pins (SI or I/O7-I/O0), and
the output pins (SO or I/O7-I/O0) will remain in a high impedance state. A high-to-low
transition on the CS pin is required to start an operation, and a low-to-high transition on
the CS pin is required to end an operation.
HARDWARE PAGE WRITE PROTECT: If the WP pin is held low, the first 256 pages
(sectors 0 and 1) of the main memory cannot be reprogrammed. The only way to repro-
gram the first 256 pages is to first drive the protect pin high and then use the program
10
AT45CS1282 [Preliminary]
3447A–DFLSH–2/04
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