CY14B256KA-SP45XI(2009) 查看數據表（PDF） - Cypress Semiconductor

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CY14B256KA-SP45XI
(Rev.:2009)

256 Kbit (32K x 8) nvSRAM with Real Time Clock

Cypress Semiconductor 

CY14B256KA

Table 1. Mode Selection

CE

WE

H

X

L

H

L

L

L

H

L

H

L

H

L

H

OE

A14 - A0[2]

Mode

I/O

Power

X

X

Not Selected Output High Z

Standby

L

X

Read SRAM

Output Data

Active

X

X

Write SRAM

Input Data

Active

L

0x0E38

Read SRAM

Output Data

Active[3]

0x31C7

Read SRAM

Output Data

0x03E0

Read SRAM

Output Data

0x3C1F

Read SRAM

Output Data

0x303F

Read SRAM

Output Data

0x0B45

AutoStore

Output Data

Disable

L

0x0E38

Read SRAM

Output Data

Active[3]

0x31C7

Read SRAM

Output Data

0x03E0

Read SRAM

Output Data

0x3C1F

Read SRAM

Output Data

0x303F

Read SRAM

Output Data

0x0B46

AutoStore

Output Data

Enable

L

0x0E38

Read SRAM

Output Data

Active ICC2[3]

0x31C7

Read SRAM

Output Data

0x03E0

Read SRAM

Output Data

0x3C1F

Read SRAM

Output Data

0x303F

Read SRAM

Output Data

0x0FC0

Nonvolatile

Output High Z

STORE

L

0x0E38

Read SRAM

Output Data

Active[3]

0x31C7

Read SRAM

Output Data

0x03E0

Read SRAM

Output Data

0x3C1F

Read SRAM

Output Data

0x303F

Read SRAM

Output Data

0x0C63

Nonvolatile

Output High Z

Recall

Preventing AutoStore

The AutoStore function is disabled by initiating an AutoStore

disable sequence. A sequence of read operations is performed

in a manner similar to the Software STORE initiation. To initiate

the AutoStore disable sequence, the following sequence of CE

or OE controlled read operations must be performed:

1. Read address 0x0E38 Valid READ

2. Read address 0x31C7 Valid READ

3. Read address 0x03E0 Valid READ

4. Read address 0x3C1F Valid READ

5. Read address 0x303F Valid READ

6. Read address 0x0B45 AutoStore Disable

The AutoStore is reenabled by initiating an AutoStore enable

sequence. A sequence of read operations is performed in a

manner similar to the Software RECALL initiation.

To initiate the AutoStore enable sequence, the following

sequence of CE or OE controlled read operations must be

performed:

1. Read address 0x0E38 Valid READ

2. Read address 0x31C7 Valid READ

3. Read address 0x03E0 Valid READ

4. Read address 0x3C1F Valid READ

5. Read address 0x303F Valid READ

6. Read address 0x0B46 AutoStore Enable

If the AutoStore function is disabled or reenabled, a manual

STORE operation (Hardware or Software) issued to save the

AutoStore state through subsequent power down cycles. The

part comes from the factory with AutoStore enabled.

Notes

2. While there are 15 address lines on the CY14B256KA, only the lower 14 are used to control software modes.

3. The six consecutive address locations must be in the order listed. WE must be HIGH during all six cycles to enable a nonvolatile cycle.

Document #: 001-55720 Rev. *A

Page 6 of 26

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