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參數(shù)資料
| 型號(hào)： | 25AA320X |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | EEPROM |
| 英文描述： | 32K SPI Bus Serial EEPROM |
| 中文描述： | 32K的SPI總線串行EEPROM |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 383K |
| 代理商： | 25AA320X |
2004 Microchip Technology Inc.
DS21227E-page 7
25AA320/25LC320/25C320
3.0
FUNCTIONAL DESCRIPTION
3.1
Principles Of Operation
The 25XX320 are 4096 byte Serial EEPROMs
designed to interface directly with the Serial Peripheral
Interface (SPI) port of many of today’s popular
microcontroller
families,
PIC16C6X/7X microcontrollers. It may also interface
with microcontrollers that do not have a built-in SPI port
by using discrete I/O lines programmed properly with
the software.
The 25XX320 contains an 8-bit instruction register. The
device is accessed via the SI pin, with data being
clocked in on the rising edge of SCK. The CS pin must
be low and the HOLD pin must be high for the entire
operation.
Table 3-1 contains a list of the possible instruction
bytes and format for device operation. All instructions,
addresses and data are transferred MSB first, LSB last.
Data is sampled on the first rising edge of SCK after CS
goes low. If the clock line is shared with other
peripheral devices on the SPI bus, the user can assert
the HOLD input and place the 25XX320 in ‘HOLD’
mode. After releasing the HOLD pin, operation will
resume from the point when the HOLD was asserted.
including
Microchip’s
3.2
Read Sequence
The device is selected by pulling CS low. The 8-bit
READ
instruction is transmitted to the 25XX320 fol-
lowed by the 16-bit address, with the four MSBs of the
address being don’t care bits. After the correct
READ
instruction and address are sent, the data stored in the
memory at the selected address is shifted out on the
SO pin. The data stored in the memory at the next
address can be read sequentially by continuing to pro-
vide clock pulses. The internal address pointer is auto-
matically incremented to the next higher address after
each byte of data is shifted out. When the highest
address is reached (0FFFh), the address counter rolls
over to address 0000h allowing the read cycle to be
continued indefinitely. The read operation is terminated
by raising the CS pin (Figure 3-1).
3.3
Write Sequence
Prior to any attempt to write data to the 25XX320, the
write enable latch must be set by issuing the
WREN
instruction (Figure 3-4). This is done by setting CS low
and then clocking out the proper instruction into the
25XX320. After all eight bits of the instruction are
transmitted, the CS must be brought high to set the
write enable latch. If the write operation is initiated
immediately after the
WREN
instruction without CS
being brought high, the data will not be written to the
array because the write enable latch will not have been
properly set.
Once the write enable latch is set, the user may
proceed by setting the CS low, issuing a
WRITE
instruction, followed by the 16-bit address, with the four
MSBs of the address being don’t care bits, and then the
data to be written. Up to 32 bytes of data can be sent to
the 25XX320 before a write cycle is necessary. The
only restriction is that all of the bytes must reside in the
same page. A page address begins with
xxxx xxxx
xxx0
0000
and ends with
xxxx
xxxx
xxx1
1111
.
If the internal address counter reaches
xxxx
xxxx
xxx1
1111
and the clock continues, the counter will
roll back to the first address of the page and overwrite
any data in the page that may have been written.
For the data to be actually written to the array, the CS
must be brought high after the least significant bit (D0)
of the
n
th
data byte has been clocked in. If CS is
brought high at any other time, the write operation will
not be completed. Refer to Figure 3-2 and Figure 3-3
for more detailed illustrations on the byte write
sequence and the page write sequence respectively.
While the write is in progress, the Status register may
be read to check the status of the WPEN, WIP, WEL,
BP1 and BP0 bits (Figure 3-6). A read attempt of a
memory array location will not be possible during a
write cycle. When the write cycle is completed, the
write enable latch is reset.
TABLE 3-1:
INSTRUCTION SET
Instruction Name
Instruction Format
Description
READ
0000 0011
0000 0010
0000 0100
0000 0110
0000 0101
0000 0001
Read data from memory array beginning at selected address
Write data to memory array beginning at selected address
Reset the write enable latch (disable write operations)
Set the write enable latch (enable write operations)
Read Status register
Write Status register
WRITE
WRDI
WREN
RDSR
WRSR
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 25AA320XT | 32K SPI Bus Serial EEPROM |
| 25LC320 | 32K 2.5V SPI Bus Serial EEPROM |
| 25LC320T | 32K SPI Bus Serial EEPROM |
| 25LC640 | 64K SPI Bus Serial EEPROM |
| 25AA640 | 64K 1.8V SPI Bus Serial EEPROM(1.8~5.5V,1MHz,64K位,10M擦寫周期,EEPROM) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 25AA320X-E/P | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:32K SPI Bus Serial EEPROM |
| 25AA320X-E/SN | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:32K SPI Bus Serial EEPROM |
| 25AA320XE/ST | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:32K SPI Bus Serial EEPROM |
| 25AA320X-E/ST | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:32K SPI Bus Serial EEPROM |
| 25AA320XE/ST14 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:32K SPI Bus Serial EEPROM |
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