le25lb643 Sanyo Semiconductor Corporation, le25lb643 Datasheet - Page 8

• Manufacturer Part Number: le25lb643
• Description: Serial Eeprom
• Manufacturer: Sanyo Semiconductor Corporation

2. Status Registers
Table 2 Status Registers
2-1. Status Register Read (RDSR)
Figure 5 Status Register Read
The status registers read the operating and setting statuses inside the device from outside (status register read) and set
the protect information (status register write). There are 8 bits in total, and “Table 2 Status Registers” gives the
significance of each bit.
The contents of the status registers can be read using the status register read command. This command can be executed
even during write operation.
“Figure 5 Status Register READ” shows the timing waveforms of status register read. Consisting only of the first bus
cycle, the status register command outputs the contents of the status registers synchronized to the falling edge of the
clock (SCK) with which the eighth bit of (05h) has been input. In terms of the output sequence, SRWP (bit7) is the first
to be output, and each time one clock is input, all the other bits up to RDY (bit0) are output in sequence, synchronized
to the falling clock edge. If the clock input is continued after RDY (bit0) has been output, the data is output by returning
to the bit (SRWP) that was first output, after which the output is repeated as long as the clock input is continued. The
data can be read by the status register read command at any time.
Bit0
Bit1
Bit2
Bit3
Bit4
Bit5
Bit6
Bit7
Bit
CS
SCK
SI
SO
SRWP
Name
WEN
RDY
BP0
BP1
×
×
×
Mode3
Mode0
Logic
0
Hight Impedance
0
1
0
1
0
1
0
1
0
0
0
0
1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
(00000101)
LE25LB643
8CLK
05h
See status register description on BP0 and BP1
Status register write disabled
Status register write enabled
Block protect information
Busy (in write operation)
7 6 5 4 3 2 1 0 7
Write disabled
Write enabled
Status Register Out
Reserved bit
Reserved bit
Reserved bit
Function
Ready
Power-on time
Information
Nonvolatile
information
Nonvolatile
information
Nonvolatile
information
No.NA1342-8/14
0
0
0
0
0