PIC16LF1847 Datasheet, PDF (328/408 Pages) Microchip Technology – 18/20/28-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC16(L)F1847
28.2 Low-Voltage Programming Entry
Mode
The Low-Voltage Programming Entry mode allows the
PIC 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.
28.3 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 28-2.
FIGURE 28-2:
ICD RJ-11 STYLE
CONNECTOR INTERFACE
ICSPDAT
VDD
246
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 28-3.
FIGURE 28-3:
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.
DS41453A-page 330
Preliminary
 2011 Microchip Technology Inc.