PIC16F526-ISLASHP datasheet(57/122 Pages) MICROCHIP

57 / 122 page

 2010 Microchip Technology Inc.

DS41326D-page 57

PIC16F526

8.10

Program Verification/Code

Protection

If the code protection bit has not been programmed, the

on-chip program memory can be read out for

verification purposes.

The first 64 locations and the last location (OSCCAL)

can be read, regardless of the code protection bit

setting.

The last memory location can be read regardless of the

code protection bit setting on the PIC16F526 device.

8.11

ID Locations

Four memory locations are designated as ID locations

where the user can store checksum or other code

identification numbers. These locations are not

accessible during normal execution, but are readable

and writable during Program/Verify.

Use only the lower 4 bits of the ID locations and always

program the upper 8 bits as ‘0’s.

8.12

In-Circuit Serial Programming™

The PIC16F526 microcontroller can be serially

programmed while in the end application circuit. This is

simply done with two lines for clock and data, and three

other lines for power, ground and the programming

voltage. This allows customers to manufacture boards

with unprogrammed devices and then program the

microcontroller just before shipping the product. This

also allows the most recent firmware, or a custom

firmware, to be programmed.

The devices are placed into a Program/Verify mode by

holding the RB1 and RB0 pins low while raising the

MCLR (VPP) pin from VIL to VIHH (see programming

specification). RB1 becomes the programming clock

and B0 becomes the programming data. Both RB1 and

RB0 are Schmitt Trigger inputs in this mode.

After Reset, a 6-bit command is then supplied to the

device. Depending on the command, 14 bits of program

data are then supplied to or from the device, depending

if the command was a Load or a Read. For complete

details of serial programming, please refer to the

PIC16F526 Programming Specifications.

A typical In-Circuit Serial Programming connection is

shown in Figure 8-15.

FIGURE 8-15:

TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

External

Connector

Signals

To Normal

Connections

To Normal

Connections

VDD

VSS

MCLR/VPP

RB1

RB0

+5V

VPP

CLK

Data

VDD

PIC16F526

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