PIC16F15213 datasheet(109/439 Pages) MICROCHIP

109 / 439 page

15.1.1.2 FSR Write

Writing/erasing the NVM through the FSR registers (e.g., the MOVWI instruction) is not supported in the PIC16F152

microcontroller family.

15.1.2

NVMREG Access

The NVMREG interface allows read/write access to all the locations accessible by FSRs, read/write access to the

User ID locations, and read-only access to the device identification, revision, and configuration data.

Writing or erasing of NVM via the NVMREG interface is prevented when the device is write-protected.

15.1.2.1 NVMREG Read Operation

To read a NVM location using the NVMREG interface, the user must:

Clear the NVMREGS bit if the user intends to access program memory locations, or set NMVREGS if the user

intends to access User ID or configuration locations.

Write the desired address into the NVMADRH:NVMADRL register pair.

Set the RD bit to initiate the read.

Once the read control bit is set, the CPU operation is suspended during the read and resumes immediately after. The

data is available in the very next cycle, in the NVMDATH:NVMDATL register pair; therefore, it can be read as two

bytes in the following instructions.

The NVMDATH:NVMDATL register pair will hold this value until another read or until it is written to by the user.

Upon completion, the RD bit is cleared by hardware.

Figure 15-1. Program Flash Memory Read Sequence

Filename:

10-000046D.vsd

Title:

FLASH PROGRAM MEMORY READ FLOWCHART

Last Edit:

8/15/2016

First Used:

PIC16(L)F15354/55

Note:

Start

Read Operation

Select Memory:

rogram Memory, DIA, DCI,

Config Words, User ID (NVMREGS)

Select

Word Address

(NVMADRH:NVMADRL)

Data read now in

NVMDATH:NVMDATL

End

Read Operation

Rev. 10-000046

5/17/2017

Example 15-1. Program Memory Read

// This code block will read 1 word of program memory

NVMCON1bits.NVMREGS = 0;

// Point to PFM

NVMADR = PFM_ADDRESS;

// Load NVMADRH:NVMADRL with PFM address

NVMCON1bits.RD = 1;

// Initiate read cycle

PFM_DATA_LOW = NVMDATL;

// PFM data low byte

PFM_DATA_HIGH = NVMDATH;

// PFM data high byte

PIC16F15213/14/23/24/43/44

NVM - Nonvolatile Memory Control

and its subsidiaries

Data Sheet

DS40002195E-page 109

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