PIC16LF1904 Datasheet, PDF (220/288 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

PIC16LF1904/6/7
20.2 Low-Voltage Programming Entry
Mode
The Low-Voltage Programming Entry mode allows the
PIC16LF1904/6/7 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 5.3 “Ultra
Low-Power Brown-out Reset (ULPBOR)” for more
information.
The LVP bit can only be reprogrammed to ‘0’ by using
the High-Voltage Programming mode.
20.3 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 20-2.
FIGURE 20-2:
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 20-3.
FIGURE 20-3:
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.
DS41569A-page 220
Preliminary
 2011 Microchip Technology Inc.