Datasheet

PIC12F510/16F506

10.12 In-Circuit Serial Programming™

(ICSP™)

The PIC12F510/16F506 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 and the

programming voltage. This allows customers to manu-

facture 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 GP1/RB1 and GP0/RB0 pins low while rais-

ing the MCLR

(VPP) pin from VIL to VIHH (see program-

ming specification). GP1/RB1 becomes the

programming clock and GP0/RB0 becomes the

programming data. Both GP1/RB1 and GP0/RB0 are

Schmitt Trigger inputs in this mode.

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

Depending on the command and if the command was a

Load or a Read, 14 bits of program data are then sup-

plied to or from the device. For complete details of serial

programming, please refer to the PIC12F510/16F506

Programming Specifications.

A typical In-Circuit Serial Programming connection is

shown in Figure 10-15.

FIGURE 10-15: TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

External

Connector

Signals

To N or m a l

Connections

To N or m a l

Connections

PIC12F510

VSS

MCLR/VPP

GP1/RB1

GP0/RB0

+5V

CLK

Data I/O

PIC16F506