PIC12F1822T-I/SL View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC12F1822T-I/SL Datasheet PDF : 398 Pages
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PIC12F/LF1822/16F/LF1823
27.0 IN-CIRCUIT SERIAL
PROGRAMMING™ (ICSP™)
ICSP™ programming allows customers to manufacture
circuit boards with unprogrammed devices. Programming
can be done after the assembly process allowing the
device to be programmed with the most recent firmware
or a custom firmware. Five pins are needed for ICSP™
programming:
• ICSPCLK
• ICSPDAT
• MCLR/VPP
• VDD
• VSS
In Program/Verify mode the program memory, user IDs
and the Configuration Words are programmed through
serial communications. The ICSPDAT pin is a bidirec-
tional I/O used for transferring the serial data and the
ICSPCLK pin is the clock input. For more information on
ICSP™ refer to the “PIC16F/LF182X/PIC12F/LF1822
Memory Programming Specification” (DS41403).
27.1 High-Voltage Programming Entry
Mode
The device is placed into High-Voltage Programming
Entry mode by holding the ICSPCLK and ICSPDAT
pins low then raising the voltage on MCLR/VPP to VIHH.
Some programmers produce VPP greater than VIHH
(9.0V), an external circuit is required to limit the VPP
voltage. See Figure 27-1 for example circuit.
FIGURE 27-1:
VPP LIMITER EXAMPLE CIRCUIT
VPP
VDD
VSS
ICSP_DATA
ICSP_CLOCK
1
2
3
4
5
NC 6
RJ11-6PIN
To MPLAB® ICD 2
R1
270 Ohm
LM431BCMX
2
3
6
7
A
A
A
A
U1 K 1
NC
NC
4
5
VREF
8
R2
R3
10k 1% 24k 1%
RJ11-6PIN
6
5
4
3
2
1
To Target Board
Note:
The ICD 2 produces a VPP voltage greater
than the maximum VPP specification of the
PIC12F/LF1822/16F/LF1823.
2010 Microchip Technology Inc.
Preliminary
DS41413A-page 315
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