MCP79522-ISLASHMS datasheet(10/58 Pages) MICROCHIP

10 / 58 page

MCP7951X/MCP7952X

DS20002300D-page 10

 2012-2022 Microchip Technology Inc.and its subsidiaries

4.0

SPI BUS OPERATION

The MCP795XX is designed to interface directly with

the Serial Peripheral Interface (SPI) port of many of

today’s popular microcontroller families, including

Microchip’s PIC® microcontrollers. It may also interface

with microcontrollers that do not have a built-in SPI port

by using discrete I/O lines programmed properly in

software to match the SPI protocol.

The MCP795XX contains an 8-bit instruction register.

The device is accessed via the SI pin, with data being

clocked in on the rising edge of SCK. The CS pin must

be low for the entire operation.

Table 4-1 contains a list of the possible instruction

bytes and format for device operation. All instructions,

addresses and data are transferred MSb first, LSb last.

Data (SI) is sampled on the first rising edge of SCK

after CS goes low.

TABLE 4-1:

INSTRUCTION SET SUMMARY

Instruction Name Instruction Format

Description

EEREAD

0000 0011

Read data from EEPROM array beginning at selected address

EEWRITE

0000 0010

Write data to EEPROM array beginning at selected address

EEWRDI

0000 0100

Reset the write enable latch (disable write operations)

EEWREN

0000 0110

Set the write enable latch (enable write operations)

SRREAD

0000 0101

Read STATUS register

SRWRITE

0000 0001

Write STATUS register

READ

0001 0011

Read data from RTCC/SRAM array beginning at selected address

WRITE

0001 0010

Write data to RTCC/SRAM array beginning at selected address

UNLOCK

0001 0100

Unlock the protected EEPROM block for a write operation

IDWRITE

0011 0010

Write data to the protected EEPROM block beginning at selected address

IDREAD

0011 0011

Read data from the protected EEPROM block beginning at the selected

address

CLRRAM

0101 0100

Clear all SRAM data to ‘0’

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