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参数资料
| 型号： | 85C92 |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | 4K CMOS Serial EEPROM(4K位,5.0V CMOS串行EEPROM) |
| 中文描述： | 4K的的CMOS串行EEPROM（4K的位和5.0V的CMOS串行EEPROM的） |
| 文件页数： | 5/8页 |
| 文件大小： | 105K |
| 代理商： | 85C92 |
1995 Microchip Technology Inc.
DS11182C-page 5
85C72/82/92
4.0
SLAVE ADDRESS
The chip address inputs A0, A1 and A2 of each 85C72/
82/92 must be externally connected to either V
ground (V
SS
), assigning to each 85C72/82/92 a unique
3-bit address. Up to eight 85C72/82/92s may be con-
nected to the bus. Chip selection is then accomplished
through software by setting the bits A0, A1 and A2 of
the transmitted slave address to the corresponding
hardwired logic levels of the selected 85C72/82/92.
After generating a START condition, the bus master
transmits the slave address consisting of a 4-bit device
code (1010) for the 85C72/82/92, followed by the chip
address bits A0, A1 and A2. In the 85C92 the seventh
bit of that byte (BA) is used to select the upper block
(addresses 100 - 1FF) or the lower block (000 - FFF) of
the array.
The eighth bit of slave address determines if the master
device wants to read or write to the 85C72/82/92 (see
Figure 4-1).
The 85C72/82/92 monitors the bus for its correspond-
ing slave address all the time. It generates an acknowl-
edge bit if the slave address was true and it is not in a
programming mode.
CC
or
FIGURE 4-1:
SLAVE ADDRESS
ALLOCATION
START
READ/WRITE
SLAVE ADDRESS
R/W
1
0
1
0
A2
A1
A0
A
5.0
BYTE PROGRAM MODE
In this mode, the master sends addresses and one
data byte to the 85C72/82/92.
Following the START condition, the device code (4-bit),
the slave address (3-bit), and the R/W bit, which is logic
LOW, are placed onto the bus by the master. This indi-
cates to the addressed 85C72/82/92 that a byte with a
word address will follow after it has generated an
acknowledge bit. Therefore, the next byte transmitted
by the master is the word address and will be written
into the address pointer of the 85C72/82/92. After
receiving the acknowledge of the 85C72/82/92, the
master device transmits the data word to be written into
the addressed memory location. The 85C72/82/92
acknowledges again and the master generates a
STOP condition. This initiates the internal program-
ming cycle of the 85C72/82/92 (see Figure 6-1).
6.0
PAGE PROGRAM MODE
To program the 85C72/82/92, the master sends
addresses and data to the 85C72/82/92 which is the
slave (see Figure 6-1). This is done by supplying a
START condition followed by the 4-bit device code, the
3-bit slave address, and the R/W bit which is defined as
a logic LOW for a write. This indicates to the addressed
slave that a word address will follow so the slave out-
puts the acknowledge pulse to the master during the
ninth clock pulse. When the word address is received
by the 85C72/82/92, it places it in the lower 8 bits of the
address pointer defining which memory location is to
be written. The 85C72/82/92 will generate an acknowl-
edge after every 8 bits received and store them con-
secutively in a 2-byte RAM until a stop condition is
detected which initiates the internal programming
cycle. If more than 2 bytes are transmitted by the mas-
ter, the 85C72/82/92 will terminate the write cycle. This
does not affect erase/write cycles of the EEPROM
array.
If the master generates a STOP condition after trans-
mitting the first data word (Point ‘P’ on Figure 6-1), byte
programming mode is entered.
The internal, completely self-timed PROGRAM cycle
starts after the STOP condition has been generated by
the master and all received (up to two) data bytes will
be written in a serial manner.
The PROGRAM cycle takes N milliseconds, whereby N
is the number of received data bytes (N max = 2).
FIGURE 6-1:
PROGRAM MODE (ERASE/WRITE)
START
STOP
A
DATA BYTE N
DATA BYTE 1
A
A
WORD
ADDRESS
A
0
R/W
P
ACKNOWLEDGES FROM SLAVE
SLAVE
ADDRESS
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相关代理商/技术参数 |
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|---|---|
| 85C92/J | 制造商:未知厂家 制造商全称:未知厂家 功能描述:I2C Serial EEPROM |
| 85C92/P | 制造商:未知厂家 制造商全称:未知厂家 功能描述:I2C Serial EEPROM |
| 85C92/SL | 制造商:未知厂家 制造商全称:未知厂家 功能描述:I2C Serial EEPROM |
| 85C92/SM | 制造商:未知厂家 制造商全称:未知厂家 功能描述:I2C Serial EEPROM |
| 85C92/SN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:I2C Serial EEPROM |
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