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CY14B256PA-SFXIT Datasheet(PDF) 9 Page - Cypress Semiconductor |
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CY14B256PA-SFXIT Datasheet(HTML) 9 Page - Cypress Semiconductor |
9 / 43 page 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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