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11AAXXX/11LCXXX
4.5 Read Status Register ( RDSR )
Instruction
The RDSR instruction provides access to the STATUS
register. The STATUS register may be read at any time,
even during a write cycle. The STATUS register is
formatted as follows:
7 6 5 4 3 2 1 0
X X X X BP1 BP0 WEL WIP
Note: Bits 4-7 are don’t cares, and will read as ‘ 0 ’.
The Write-In-Process (WIP) bit indicates whether the
11XX is busy with a write operation. When set to a ‘ 1 ’,
a write is in progress, when set to a ‘ 0 ’, no write is in
progress. This bit is read-only.
The Write Enable Latch (WEL) bit indicates the status
of the write enable latch. When set to a ‘ 1 ’, the latch
allows writes to the array, when set to a ‘ 0 ’, the latch
prohibits writes to the array. This bit is set and cleared
using the WREN and WRDI instructions, respectively.
This bit is read-only for any other instruction.
The Block Protection (BP0 and BP1) bits indicate
which blocks are currently write-protected. These bits
are set by the user through the WRSR instruction.
These bits are nonvolatile.
Note: If Read Status Register command is
initiated while the 11XX is currently
executing an internal write cycle on the
STATUS register, the new Block
Protection bit values will be read during
the entire command.
The WIP and WEL bits will update dynamically (asyn-
chronous to issuing the RDSR instruction). Further-
more, after the STATUS register data is received, the
master can provide a MAK during the Acknowledge
sequence to request that the data be transmitted again.
This allows the master to continuously monitor the WIP
and WEL bits without the need to issue another full
command.
Once the master is finished, it provides a NoMAK to
end the operation.
Note: The current drawn for a Read Status
Register command during a write cycle
is a combination of the I CC Read and I CC
Write operating currents.
FIGURE 4-6:
READ STATUS REGISTER COMMAND SEQUENCE
SCIO
SCIO
Standby Pulse
Command
0 0 0 0 0 1 0 1
Start Header
0 1 0 1 0 1 0 1
STATUS Register Data
3 2 1 0
0 0 0 0
Device Address
1 0 1 0 0 0 0 0 (1)
Note 1: For the 11XXXX1, this bit must be a ‘ 1 ’.
Note 2: The STATUS register data can continuously be read, or polled, by transmitting a MAK in place of the NoMAK.
DS22067H-page 14
Preliminary
? 2010 Microchip Technology Inc.
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11LC161-E/SN
功能描述:电可擦除可编程只读存储器 16K 2048 X 8 2.5V SERIAL EE EXT RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
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