PIC12LF1571 Datasheet, PDF (1/32 Pages) Microchip Technology – HIGH-VOLTAGE ICSP PROGRAMMING

PIC12(L)F1571/2
PIC12(L)F1571/2 Memory Programming Specification
This document includes the
programming specifications for the
following devices:
• PIC12F1571 • PIC12LF1571
• PIC12F1572 • PIC12LF1572
1.0 OVERVIEW
The device can be programmed using either the high-
voltage In-Circuit Serial Programming™ (ICSP™)
method or the low-voltage ICSP method.
1.1 Hardware Requirements
1.1.1
HIGH-VOLTAGE ICSP
PROGRAMMING
In High-Voltage ICSP mode, the device requires two
programmable power supplies: one for VDD and one for
the MCLR/VPP pin.
1.1.2
LOW-VOLTAGE ICSP
PROGRAMMING
In Low-Voltage ICSP mode, these devices can be
programmed using a single VDD source in the
operating range. The MCLR/VPP pin does not have to
be brought to a different voltage, but can instead be left
at the normal operating voltage.
1.1.2.1 Single-Supply ICSP Programming
The LVP bit in Configuration Word 2 enables single-
supply (low-voltage) ICSP programming. The LVP bit
defaults to a ‘1’ (enabled) from the factory. The LVP bit
may only be programmed to ‘0’ by entering the High-
Voltage ICSP mode, where the MCLR/VPP pin is raised
to VIHH. Once the LVP bit is programmed to a ‘0’, only
the High-Voltage ICSP mode is available and only the
High-Voltage ICSP mode can be used to program the
device.
Note 1: The High-Voltage ICSP mode is always
available, regardless of the state of the
LVP bit, by applying VIHH to the MCLR/
VPP pin.
2: While in Low-Voltage ICSP mode, MCLR
is always enabled, regardless of the
MCLRE bit, and the port pin can no
longer be used as a general purpose
input.
1.2 Pin Utilization
Five pins are needed for ICSP programming. The pins
are listed in Table 1-1.
TABLE 1-1: PIN DESCRIPTIONS DURING PROGRAMMING FOR PIC12(L)F1571/2
Pin Name
Function
During Programming
Pin Type
Pin Description
ICSPCLK
ICSPCLK
I
Clock Input – Schmitt Trigger Input
ICSPDAT
ICSPDAT
I/O
Data Input/Output – Schmitt Trigger Input
MCLR/VPP
Program/Verify mode
P⁽¹⁾
Program Mode Select/Programming Power Supply
VDD
VDD
P
Power Supply
VSS
VSS
P
Ground
Legend:
Note 1:
I = Input, O = Output, P = Power
The programming high voltage is internally generated. To activate the Program/Verify mode, high voltage
needs to be applied to MCLR input. Since the MCLR is used for a level source, MCLR does not draw any
significant current.
 2013 Microchip Technology Inc.
DS40001713A-page 1