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CY14B256PA-SFXIT Datasheet(PDF) 9 Page - Cypress Semiconductor

Part # CY14B256PA-SFXIT
Description  256-Kbit (32 K 횞 8) SPI nvSRAM with Real Time Clock
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CY14B256PA-SFXIT Datasheet(HTML) 9 Page - Cypress Semiconductor

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CY14C256PA
CY14B256PA
CY14E256PA
Document Number: 001-65281 Rev. *E
Page 9 of 43
SPI Functional Description
The CY14X256PA uses an 8-bit instruction register. Instructions
and their operation codes are listed in Table 1. All instructions,
addresses, and data are transferred with the MSB first and start
with a HIGH to LOW CS transition. There are, in all, 21 SPI
instructions that provide access to most of the functions in
nvSRAM. Further, the WP, HOLD, and HSB pins provide
additional functionality driven through hardware.
The SPI instructions in CY14X256PA are divided based on their
functionality in these types:
Status Register control instructions:
• Status Register access: RDSR, FAST_RDSR and WRSR
instructions
• Write protection and block protection: WREN and WRDI
instructions along with WP pin and WEN, BP0, and BP1
bits
SRAM Read/Write instructions
• Memory access: READ, FAST_READ, and WRITE
instructions
RTC Read/Write instructions
• RTC
access:
RDRTC,
FAST_RDRTC
and
WRTC
instructions
Special NV instructions
• nvSRAM special instructions: STORE, RECALL, ASENB,
and ASDISB
Special instructions: SLEEP, WRSN, RDSN, FAST_RDSN,
RDID, FAST_RDID
Table 1. Instruction Set
Instruction Category
Instruction Name
Opcode
Operation
Status Register Control Instructions
Status Register access
RDSR
0000 0101
Read Status Register
FAST_RDSR
0000 1001
Fast Status Register read - SPI clock > 40 MHz
WRSR
0000 0001
Write Status Register
Write protection and block
protection
WREN
0000 0110
Set Write Enable latch
WRDI
0000 0100
Reset Write Enable latch
SRAM Read/Write Instructions
Memory access
READ
0000 0011
Read data from memory array
FAST_READ
0000 1011
Fast read - SPI clock > 40 MHz
WRITE
0000 0010
Write data to memory array
RTC Read/Write Instructions
RTC access
RDRTC
0001 0011
Read RTC registers
FAST_RDRTC
0001 1101
Fast RTC register read - SPI clock > 25 MHz
WRTC
0001 0010
Write RTC registers
Special NV Instructions
nvSRAM special functions
STORE
0011 1100
Software STORE
RECALL
0110 0000
Software RECALL
ASENB
0101 1001
AutoStore enable
ASDISB
0001 1001
AutoStore disable
Special Instructions
Sleep
SLEEP
1011 1001
Sleep mode enable
Serial number
WRSN
1100 0010
Write serial number
RDSN
1100 0011
Read serial number
FAST_RDSN
1100 1001
Fast serial number read - SPI clock > 40 MHz
Device ID read
RDID
1001 1111
Read manufacturer JEDEC ID and product ID
FAST_RDID
1001 1001
Fast manufacturer JEDEC ID and product ID Read -
SPI clock > 40 MHz
Reserved
- Reserved -
0001 1110


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