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CAT15002 Arkusz danych(PDF) 11 Page - Catalyst Semiconductor

Numer części CAT15002
Szczegółowy opis  Voltage Supervisor with 2-Kb and 4-Kb SPI Serial CMOS EEPROM
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Producent  CATALYST [Catalyst Semiconductor]
Strona internetowa  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT15002 Arkusz danych(HTML) 11 Page - Catalyst Semiconductor

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CAT15002, CAT15004
© 2007 Catalyst Semiconductor, Inc.
11
Doc. No. 1126 Rev. A
Characteristics subject to change without notice
READ OPERATIONS
Read from Memory Array
To read from memory, the host sends a READ
instruction followed by an 8-bit address (for the
CAT15008, bit 3 of the Read instruction opcode
contains address bit A8).
After receiving the last address bit, the CAT15002/04
will respond by shifting out data on the SO pin (as
shown in Figure 10). Sequentially stored data can be
read out by simply continuing to run the clock. The
internal address pointer is automatically incremented
to the next higher address as data is shifted out. After
reaching the highest memory address, the address
counter “rolls over” to the lowest memory address, and
the read cycle can be continued indefinitely. The read
operation is terminated by taking CS
¯¯ high.
Read Status Register
To read the status register, the host simply sends a
RDSR command. After receiving the last bit of the
command, the CAT15002/04 will shift out the contents
of the status register on the SO pin (Figure 11). The
status register may be read at any time, including
during an internal write cycle.
Figure 10. READ Timing
Notes:
* Please check the instruction set table for address
X = 0 for CAT15002; X=A8 for CAT15004
Dashed Line = mode (1, 1) - - - - - -
Figure 11. RDSR Timing
Note: Dashed Line = mode (1, 1) - - - - - -
01
2
3
4
5
6
78
10
911
12
13
14
SCK
SI
DATA OUT
MSB
HIGH IMPEDANCE
OPCODE
SO
7
6
5
4
3
2
1
0
CS
00
0
00
1
0
1
21
22
SCK
SI
SO
00
00
001
1
BYTE ADDRESS
0
1
2
3
4
5
6
7
8
9
10
121314
1516
1718
1920
D7 D6 D5 D4 D3 D2 D1 D0
CS
OPCODE
DATA OUT
MSB
HIGH IMPEDANCE
11
A7 A6 A5
A4
A3
A2 A1 A0
X*


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