PIC16F15213 datasheet(35/439 Pages) MICROCHIP

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RETLW DATA1

;Index1 data

RETLW DATA2

RETLW DATA3

my_function

;LOTS OF CODE....

MOVLW

DATA_INDEX

call constants

;THE CONSTANT IS IN W

The BRW instruction eases the implementation of this type of table.

9.1.1.2

Indirect Read with FSR

The program memory can be accessed as data by setting bit 7 of an FSRxH register and reading the matching

INDFx register. The MOVIW instruction will place the lower eight bits of the addressed word in the W register. Writes

to the program memory cannot be performed via the INDFx registers. Instructions that read the program memory via

the FSR require one extra instruction cycle to complete. The following example demonstrates reading the program

memory via an FSR.

The high directive will set bit 7 if a label points to a location in the program memory. This applies to the assembly

code shown below.

Example 9-2. Read of Program Memory Using FSR Register

constants

RETLW DATA0

;Index0 data

RETLW DATA1

;Index1 data

RETLW DATA2

RETLW DATA3

my_function

;LOTS OF CODE....

MOVLW

LOW constants

MOVWF

FSR1L

MOVLW

HIGH constants

MOVWF

FSR1H

MOVIW

2[FSR1]

;DATA2 IS IN W

9.1.2

Memory Access Partition (MAP)

User Flash is partitioned into:

• Application Block

• Boot Block

• Storage Area Flash (SAF) Block

The user can allocate the memory usage by setting the BBEN bit, selecting the size of the partition defined by

BBSIZE bits and enabling the Storage Area Flash by the SAFEN bit.

9.1.2.1

Application Block

Default settings of the Configuration bits (BBEN = 1 and SAFEN = 1) assign all memory in the user Flash area to the

application block.

9.1.2.2

Boot Block

If BBEN = 1, the Boot Block is enabled and a specific address range is allotted as the Boot Block, based on the value

of the BBSIZE bits.

9.1.2.3

Storage Area Flash

Storage Area Flash (SAF) is enabled by clearing the SAFEN bit. If enabled, the SAF block is placed at the end of

memory and spans 128 words. If the Storage Area Flash (SAF) is enabled, the SAF area is not available for program

execution.

PIC16F15213/14/23/24/43/44

Memory Organization

and its subsidiaries

Data Sheet

DS40002195E-page 35

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