Datasheet

Table Of Contents
2011 Microchip Technology Inc. Preliminary DS41615A-page 209
PIC12(L)F1501
25.0 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 bidirec-
tional I/O used for transferring the serial data and the
ICSPCLK pin is the clock input. For more information on
ICSP™ refer to the “
PIC16193X/PIC16LF193X Memory
Programming Specification
” (DS41360).
25.1 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.
25.2 Low-Voltage Programming Entry
Mode
The Low-Voltage Programming Entry mode allows the
PIC
®
Flash MCUs to be programmed using VDD only,
without high voltage. When the LVP bit of Configuration
Words 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 to0’.
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 V
IL 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 MCLR for more infor-
mation.
The LVP bit can only be reprogrammed to ‘0’ by using
the High-Voltage Programming mode.
25.3 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 25-1.
FIGURE 25-1: ICD RJ-11 STYLE
CONNECTOR INTERFACE
Another connector often found in use with the PICkit™
programmers is a standard 6-pin header with 0.1 inch
spacing. Refer to Figure 25-2.
1
2
3
4
5
6
Target
Bottom Side
PC Board
VPP/MCLR
VSS
ICSPCLK
V
DD
ICSPDAT
NC
Pin Description*
1 = V
PP/MCLR
2 = VDD Target
3 = V
SS (ground)
4 = ICSPDAT
5 = ICSPCLK
6 = No Connect