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CAT25C64S16A-TE13 датащи(PDF) 4 Page - Catalyst Semiconductor

номер детали CAT25C64S16A-TE13
подробное описание детали  64K/128K-Bit SPI Serial CMOS E2PROM
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производитель  CATALYST [Catalyst Semiconductor]
домашняя страница  http://www.catalyst-semiconductor.com
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CAT25C64S16A-TE13 датащи(HTML) 4 Page - Catalyst Semiconductor

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CAT25C64/128
Doc. No. 25069-00 6/99 SPI-1
Advance Information
FUNCTIONAL DESCRIPTION
The CAT25C64/128 supports the SPI bus data trans-
mission protocol. The synchronous Serial Peripheral
Interface (SPI) helps the CAT25C64/128 to interface
directly with many of today’s popular microcontrollers.
The CAT25C64/128 contains an 8-bit instruction regis-
ter. (The instruction set and the operation codes are
detailed in the instruction set table)
After the device is selected with
CS going low, the first
byte will be received. The part is accessed via the SI pin,
with data being clocked in on the rising edge of SCK.
The first byte contains one of the six op-codes that define
the operation to be performed.
PIN DESCRIPTION
SI: Serial Input
SI is the serial data input pin. This pin is used to input all
opcodes, byte addresses, and data to be written to the
25C64/128. Input data is latched on the rising edge of
the serial clock.
SO: Serial Output
SO is the serial data output pin. This pin is used to
transfer data out of the 25C64/128. During a read cycle,
data is shifted out on the falling edge of the serial clock.
SCK: Serial Clock
SCK is the serial clock pin. This pin is used to synchro-
nize the communication between the microcontroller
and the 25C64/128. Opcodes, byte addresses, or data
present on the SI pin are latched on the rising edge of the
SCK. Data on the SO pin is updated on the falling edge
of the SCK.
CS
CS
CS
CS
CS: Chip Select
CS is the Chip select pin. CS low enables the CAT25C64/
128 and
CS high disables the CAT25C64/128. CS high
takes the SO output pin to high impedance and forces
the devices into a Standby Mode (unless an internal
write operation is underway). The CAT25C64/128 draws
ZERO current in the Standby mode. A high to low
transition on
CS is required prior to any sequence being
initiated. A low to high transition on
CS after a valid write
sequence is what initiates an internal write cycle.
WP
WP
WP
WP
WP: Write Protect
WP is the Write Protect pin. The Write Protect pin will
allow normal read/write operations when held high.
When
WP is tied low and the WPEN bit in the status
register is set to “1”, all write operations to the status
register are inhibited.
WP going low while CS is still low
will interrupt a write to the status register. If the internal
write cycle has already been initiated,
WP going low will
have no effect on any write operation to the status
register. The
WP pin function is blocked when the WPEN
bit is set to 0.
HOLD
HOLD
HOLD
HOLD
HOLD: Hold
The
HOLD pin is used to pause transmission to the
CAT25C64/128 while in the middle of a serial sequence
without having to re-transmit entire sequence at a later
time. To pause,
HOLD must be brought low while SCK
is low. The SO pin is in a high impedance state during the
time the part is paused, and transitions on the SI pins will
be ignored. To resume communication,
HOLD is brought
high, while SCK is low.
(HOLD should be held high any
time this function is not being used.)
HOLD may be tied
high directly to Vcc or tied to Vcc through a resistor.
Figure 9 illustrates hold timing sequence.
Instruction
Opcode
Operation
WREN
0000 0110
Enable Write Operations
WRDI
0000 0100
Disable Write Operations
RDSR
0000 0101
Read Status Register
WRSR
0000 0001
Write Status Register
READ
0000 0011
Read Data from Memory
WRITE
0000 0010
Write Data to Memory
INSTRUCTION SET


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