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PIC16F1946 Scheda tecnica(PDF) 371 Page - Microchip Technology

Il numero della parte PIC16F1946
Spiegazioni elettronici  64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology
PDF  448 Pages
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Produttore elettronici  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F1946 Scheda tecnica(HTML) 371 Page - Microchip Technology

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 2010-2011 Microchip Technology Inc.
Preliminary
DS41414C-page 371
PIC16(L)F1946/1947
28.0
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
bidirectional I/O used for transferring the serial data
and the ICSPCLK pin is the clock input. For more
information
on
ICSP™
refer
to
the
“PIC16F193X/LF193X/PIC16F194X/LF194X Memory
Programming Specification
” (DS41397).
28.1
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 28-1 for example circuit.
FIGURE 28-1:
VPP LIMITER EXAMPLE CIRCUIT
VREF
VPP
VDD
VSS
ICSP_DATA
ICSP_CLOCK
NC
RJ11-6PIN
RJ11-6PIN
R1
270 Ohm
To MPLAB® ICD 2
To Target Board
1
2
3
4
5
61
2
3
4
5
6
R2
R3
10k 1%
24k 1%
U1
LM431BCMX
A
2
3
6
7
8
A
A
A
K
NC
NC
1
4
5



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