CY14B256P-SFXIT 데이터 시트보기 (PDF) - Cypress Semiconductor

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CY14B256P-SFXIT

256-Kbit (32 K × 8) Serial (SPI) nvSRAM with Real Time Clock

Cypress Semiconductor 

CY14B256P

Contents

Pinouts .............................................................................. 3

Device Operation .............................................................. 4

SRAM Write.................................................................. 4

SRAM Read ................................................................ 4

STORE Operation ....................................................... 4

AutoStore Operation .................................................... 4

Software STORE Operation ........................................ 5

Hardware STORE and HSB Pin Operation ................. 5

RECALL Operation...................................................... 5

Hardware RECALL (Power-Up) .................................. 5

Software RECALL ....................................................... 5

Disabling and Enabling AutoStore............................... 5

Noise Considerations....................................................... 5

Serial Peripheral Interface ............................................... 6

SPI Overview ............................................................... 6

SPI Modes ......................................................................... 7

SPI Operating Features..................................................... 8

Power-Up .................................................................... 8

Power On Reset .......................................................... 8

Power-Down ................................................................ 8

Active Power and Stand ................... by Power Modes 8

SPI Functional Description.............................................. 8

Status Register ................................................................. 9

Read Status Register (RDSR) Instruction ................... 9

Write Status Register (WRSR) Instruction .................. 9

Write Protection and Block Protection ......................... 10

Write Enable (WREN) Instruction .............................. 10

Write Disable (WRDI) Instruction .............................. 10

Block Protection ........................................................ 10

Hardware Write Protection (WP Pin)......................... 11

Memory Access .............................................................. 11

Read Sequence (READ) instruction .......................... 11

Write Sequence (WRITE) instruction ........................ 11

RTC Access ..................................................................... 13

READ RTC (RDRTC) Instruction .............................. 13

WRITE RTC (WRTC) Instruction ............................... 13

Software STORE (STORE) instruction ...................... 14

Software RECALL (RECALL) instruction .................. 14

AutoStore Enable (ASENB) instruction ..................... 14

AutoStore Disable (ASDISB) instruction ................... 15

HOLD Pin Operation ................................................. 15

Real Time Clock Operation............................................. 16

nvTime Operation...................................................... 16

Clock Operations ....................................................... 16

Reading the Clock ..................................................... 16

Setting the Clock ....................................................... 16

Backup Power ........................................................... 16

Stopping and Starting the Oscillator .......................... 16

Calibrating the Clock ................................................. 17

Alarm ......................................................................... 17

Watchdog Timer ........................................................ 17

Power Monitor ........................................................... 18

Interrupts ................................................................... 18

Flags Register ........................................................... 18

Accessing the Real Time Clock through SPI............. 19

Best Practices................................................................. 24

Maximum Ratings ........................................................... 25

DC Electrical Characteristics ........................................ 25

Data Retention and Endurance ..................................... 26

Capacitance .................................................................... 26

Thermal Resistance........................................................ 26

AC Test Conditions ........................................................ 26

RTC Characteristics ....................................................... 27

AC Switching Characteristics ....................................... 27

AutoStore or Power-Up RECALL .................................. 29

Software Controlled STORE/RECALL Cycles .............. 30

Hardware STORE Cycle ................................................. 31

Ordering Information ...................................................... 32

Ordering Code Definition........................................... 32

Package Diagram ............................................................ 33

Acronyms ........................................................................ 34

Document Conventions ................................................. 34

Units of Measure ....................................................... 34

Document History Page ................................................. 35

Sales, Solutions, and Legal Information ...................... 36

Worldwide Sales and Design Support....................... 36

Products .................................................................... 36

PSoC Solutions ......................................................... 36

Document Number: 001-53881 Rev. *F

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