P12C508 datasheet(36/84 Pages) MICROCHIP

36 / 84 page

PIC12C5XX

DS40139A-page 36

Advanced Information

7.12

In-Circuit Serial Programming

The PIC12C5XX 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 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 device is placed into a program/verify mode by

holding the GP1 and GP0 pins low while raising the

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

speciﬁcation). GP1 becomes the programming clock

and GP0 becomes the programming data. Both GP1

and GP0 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 pro-

gram 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 PIC12C5XX Programming Speciﬁcations.

A typical in-circuit serial programming connection is

shown in Figure 7-15.

FIGURE 7-15: TYPICAL IN-CIRCUIT SERIAL

PROGRAMMING

CONNECTION

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC12C5XX

VDD

VSS

MCLR/VPP

GP1

GP0

+5V

VPP

CLK

Data I/O

VDD

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