PIC12F519-ESLASHMS datasheet(49/88 Pages) MICROCHIP

49 / 88 page

Preliminary

DS41319A-page 47

PIC12F519

8.9

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 PIC12F519 device.

8.10

ID Locations

Four memory locations are designated as ID locations

where users 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.

8.11

In-Circuit Serial Programming™

The PIC12F519 device 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 users to manufacture boards with unprogrammed

PIC12F519 device and then program the PIC12F519

device just before shipping the product. This also allows

the most recent firmware, or a custom firmware, to be

programmed.

The PIC12F519 device is placed into a Program/Verify

mode by holding the RB1 and RB0 pins low while rais-

ing the MCLR (VPP) pin from VIL to VIHH (see program-

ming specification). The RB1 pin becomes the

programming clock, and the RB0 pin becomes the

programming data. Both RB1 and RB0 pins 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

“PIC12F519 Memory Programming Specification,”

(DS41316).

A typical In-Circuit Serial Programming connection is

shown in Figure 8-12.

FIGURE 8-12:

TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC12F519

VDD

VSS

MCLR/VPP

RB1

RB0

+5V

VPP

CLK

Data I/O

VDD

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