PIC12F1822T-I/SL View Datasheet(PDF) - Microchip Technology
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PIC12F1822T-I/SL Datasheet PDF : 398 Pages
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PIC12F/LF1822/16F/LF1823
27.2 Low-Voltage Programming Entry
Mode
The Low-Voltage Programming Entry mode allows the
PIC12F/LF1822/16F/LF1823 devices to be
programmed using VDD only, without high voltage.
When the LVP bit of Configuration Word 2 is set to ‘1’,
the low-voltage ICSP programming entry is enabled. To
disable the Low-Voltage ICSP mode, the LVP bit must
be programmed to ‘0’.
Entry into the Low-Voltage Programming Entry mode
requires the following steps:
1. MCLR is brought to VIL.
2. A 32-bit key sequence is presented on
ICSPDAT, while clocking ICSPCLK.
Once the key sequence is complete, MCLR must be
held at VIL for as long as Program/Verify mode is to be
maintained.
If low-voltage programming is enabled (LVP = 1), the
MCLR Reset function is automatically enabled and
cannot be disabled. See Section 7.3 “MCLR” for more
information.
The LVP bit can only be reprogrammed to ‘0’ by using
the High-Voltage Programming mode.
27.3 Common Programming Interfaces
Connection to a target device is typically done through
an ICSP™ header. A commonly found connector on
development tools is the RJ-11 in the 6P6C (6 pin, 6
connector) configuration. See Figure 27-2.
FIGURE 27-2:
ICD RJ-11 STYLE
CONNECTOR INTERFACE
ICSPDAT
VDD
2 4 6 NC
ICSPCLK
13 5
Target
VPP/MCLR
VSS
PC Board
Bottom Side
Pin Description*
1 = VPP/MCLR
2 = VDD Target
3 = VSS (ground)
4 = ICSPDAT
5 = ICSPCLK
6 = No Connect
Another connector often found in use with the PICkit™
programmers is a standard 6-pin header with 0.1 inch
spacing. Refer to Figure 27-3.
FIGURE 27-3:
PICkit™ STYLE CONNECTOR INTERFACE
Pin 1 Indicator
Pin Description*
1
1 = VPP/MCLR
2
3
2 = VDD Target
4
3 = VSS (ground)
5
6
4 = ICSPDAT
5 = ICSPCLK
6 = No Connect
* The 6-pin header (0.100" spacing) accepts 0.025" square pins.
DS41413A-page 316
Preliminary
2010 Microchip Technology Inc.
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