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ST95020WB1TR Datenblatt(PDF) 6 Page - STMicroelectronics

Teilenummer ST95020WB1TR
Bauteilbeschribung  4K/2K/1K Serial SPI EEPROM with Positive Clock Strobe
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST95020WB1TR Datenblatt(HTML) 6 Page - STMicroelectronics

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Write Status Register (WRSR)
The WRSR instruction allows the user to select the
size of protected memory. The user may read the
blocks but will be unable to write within the pro-
tected blocks. The blocks and respective WRSR
control bits are shown in Table 4.
When the WRSR instruction and the 8 bits of the
Status Register are latched-in, the internal write
cycle is then triggered by the rising edge of S.
This rising edge of S must appear no later than the
16th clock cycle of the WRSR instruction of the
Status Register content (it must not appear a 17th
clock pulse before the rising edge of S), otherwise
the internal write sequence is not performed.
Read Operation
The chip is first selected by putting S low. The serial
one byte read instruction is followed by a one byte
address (A7-A0), each bit being latched-in during
the rising edge of the clock (C). Bit 3 (see Table 3)
of the read instruction contains address bit A8
(most significant address bit). Then the data stored
in the memory at the selected addressis shifted out
on the Q output pin; each bit being shifted out
during the falling edge of the clock (C). The data
stored in the memory at the next address can be
read in sequence by continuing to provide clock
pulses. The byte address is automatically incre-
mented to the next higher address after each byte
of data is shifted out. When the highest address is
reached, the address counter rolls over to 0h allow-
ing the read cycle to be continued indefinitely. The
read operation is terminated by deselecting the
chip. The chip can be deselectedat anytime during
data output. Any read attempt during a write cycle
will be rejected and will deselect the chip.
C
D
AI01440
S
Q
A7
2
1
3
4
5
6
7
8
9 10 1112 131415 1617 1819
A6 A5 A4 A3 A2 A1 A0
A8
20 21 22 23
765
43
2
0
1
HIGH IMPEDANCE
DATA OUT
INSTRUCTION
BYTE ADDRESS
0
Figure 6. Read Operation Sequence
Status Register Bits
Protected Block
Array Address Protected
BP1
BP0
ST95040
ST95020
ST95010
0
0
none
none
none
none
0
1
Upper quarter
180h - 1FFh
C0h - FFh
60h - 7Fh
1
0
Upper half
100h - 1FFh
80h - FFh
40h - 7Fh
1
1
Whole memory
000h - 1FFh
00h - FFh
00h - 7Fh
Table 4. Write Protected Block Size
Notes:
A8 = A7 = 0 on ST95010; A8 = 0 on ST95020; A8 is only active on ST95040.
6/18
ST95040, ST95020, ST95010


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