PIC16F913 datasheet(205/272 Pages) MICROCHIP

205 / 272 page

Preliminary

DS41250E-page 203

PIC16F917/916/914/913

16.8

Code Protection

the

code

protection

bit(s)

have

not

been

programmed, the on-chip program memory can be

read out using ICSP for verification purposes.

16.9

ID Locations

Four memory locations (2000h-2003h) 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 mode.

Only the Least Significant 7 bits of the ID locations are

used.

16.10 In-Circuit Serial Programming

The PIC16F917/916/914/913 microcontrollers 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

• programming voltage

This allows customers to manufacture boards with

unprogrammed devices and then program the micro-

controller just before shipping the product. This also

allows the most recent firmware or a custom firmware

to be programmed.

The device is placed into a Program/Verify mode by

holding

the

RB7/ICSPDAT/ICDDAT/SEG13

and

RB6/ICSPCLK/ICDCK/SEG14 pins low, while raising the

MCLR

(VPP)

from

VIL

VIHH.

See

“PIC16F917/916/914/913

Memory

Programming

Specification”

(DS41244)

for

information.

RB7/ICSPDAT/ICDDAT/SEG13

becomes

the

programming data and RB6/ICSPCLK/ICDCK/SEG14

becomes

the

programming

clock.

Both

RB7/ICSPDAT/ICDDAT/SEG13

and

RB6/ICSPCLK/ICDCK/SEG14 are Schmitt Trigger inputs

in this mode.

After Reset, to place the device into Program/Verify

mode, the Program Counter (PC) is at location 00h. 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 on

whether the command was a load or a read. For

complete details of serial programming, please refer to

the “PIC16F917/916/914/913 Memory Programming

Specification” (DS41244).

A typical In-Circuit Serial Programming connection is

shown in Figure 16-11.

FIGURE 16-11:

TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

Note:

The entire data EEPROM and Flash

program memory will be erased when the

code protection is turned off. See the

“PIC16F917/916/914/913 Memory Pro-

gramming Specification” (DS41244) for

more information.

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC16F917/916/

VDD

VSS

RE3/MCLR/VPP

RB6/ICSPCLK/

RB7/ICSPDATA/

+5V

VPP

CLK

Data I/O

* Isolation devices (as required)

ICDCK/SEG14

ICDDAT/SEG13

914/913

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