CY14C101PA

CY14B101PA

CY14E101PA

Document Number: 001-54392 Rev. *L

Page 9 of 43

SPI Functional Description

The CY14X101PA 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 CY14X101PA are divided based on their

functionality in these types:

structions

structions along with WP pin and WEN, BP0, and BP1 bits

tions

tions

and ASDISB

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