PIC16F1508TESSQTO datasheet(96/384 Pages) MICROCHIP

96 / 384 page

PIC16(L)F1508/9

DS41609A-page 96

Preliminary

 2011 Microchip Technology Inc.

10.2.1

READING THE FLASH PROGRAM

MEMORY

To read a program memory location, the user must:

Write

the

desired

address

the

PMADRH:PMADRL register pair.

Clear the CFGS bit of the PMCON1 register.

Then, set control bit RD of the PMCON1 register.

Once the read control bit is set, the program memory

Flash controller will use the second instruction cycle to

read the data. This causes the second instruction

immediately following the “BSF PMCON1,RD” instruction

to be ignored. The data is available in the very next cycle,

in the PMDATH:PMDATL register pair; therefore, it can

be read as two bytes in the following instructions.

PMDATH:PMDATL register pair will hold this value until

another read or until it is written to by the user.

FIGURE 10-1:

FLASH PROGRAM

MEMORY READ

FLOWCHART

Note:

The two instructions following a program

memory read are required to be NOPs.

This prevents the user from executing a

two-cycle

instruction

the

instruction after the RD bit is set.

Start

Read Operation

Select

Program or Configuration Memory

(CFGS)

Select

Word Address

(PMADRH:PMADRL)

End

Read Operation

Instruction Fetched ignored

NOP execution forced

Instruction Fetched ignored

NOP execution forced

Initiate Read operation

(RD = 1)

Data read now in

PMDATH:PMDATL

PIC16F1508TESSQTO Datasheet(PDF) 96 Page - Microchip Technology

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