CAT25010 Просмотр технического описания (PDF) - Catalyst Semiconductor => Onsemi

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CAT25010

1-Kb, 2-Kb and 4-Kb SPI Serial CMOS EEPROM

Catalyst Semiconductor => Onsemi 

CAT25010, CAT25020, CAT25040

Write Status Register

The Status Register is written by sending a WRSR

instruction according to timing shown in Figure 6. Only

bits 2 and 3 can be written using the WRSR

command.

Write Protection

When ¯W¯P¯ input is low all write operations to the

memory array and Status Register are inhibited. ¯W¯P¯

going low while C¯¯S is still low will interrupt a write to

the status register. If the internal write cycle has

already been initiated, ¯W¯P¯ going low will have no

effect on any write operation to the Status Register.

The ¯W¯P¯ input timing is shown in Figure 7.

Figure 6. WRSR Timing

CS

SCK

0

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15

OPCODE

SI

0

0

0

0

00

0

SO

HIGH IMPEDANCE

Note: Dashed Line = mode (1, 1) - - - - - -

DATA IN

1

7

6

5

4

32

10

MSB

Figure 7. ¯W¯P¯ Timing

t WPS

t WPH

CS

SCK

WP

WP

Note: Dashed Line = mode (1, 1) - - - - - -

Doc. No. MD-1006 Rev. T

8

© Catalyst Semiconductor, Inc.

Characteristics subject to change without notice

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