Microchip PIC32MX250F256L Manual

Microchip Ikke kategoriseret PIC32MX250F256L

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2007-2021 Microchip Technology Inc. DS60001145AA-page 1
PIC32
1.0 DEVICE OVERVIEW
This document defines the Flash programming
specification for the PIC32 family of 32-bit
microcontrollers.
This programming specification is designed to guide
developers of external programmer tools. Customers
who are developing applications for PIC32 devices
should use development tools that already provide
support for device programming.
The major topics of discussion include:
•Section 1.0 “Device Overview”
•Section 2.0 “Programming Overview”
•Section 3.0 “Programming Steps”
•Section 4.0 “Connecting to the Device”
•Section 5.0 “EJTAG vs. ICSP”
•Section 6.0 “Pseudo Operations”
•Section 7.0 “Entering 2-Wire Enhanced ICSP
Mode”
•Section 8.0 “Check Device Status”
•Section 9.0 “Erasing the Device”
•Section 10.0 “Entering Serial Execution Mode”
•Section 11.0 “Downloading the Programming
Executive (PE)”
•Section 12.0 “Downloading a Data Block”
•Section 13.0 “Initiating a Page Erase”
•Section 14.0 “Initiating a Flash Row Write”
•Section “”
•Section 16.0 “Exiting Programming Mode”
•Section 17.0 “The Programming Executive”
•Section 18.0 “Checksum”
•Section 19.0 “Configuration Memory and Device
ID”
•Section 20.0 “TAP Controllers”
•Section 21.0 “AC/DC Characteristics and Timing
Requirements”
•Appendix A: “PIC32 Flash Memory Map”
•Appendix B: “Hex File Format”
•Appendix C: “Device IDs”
•Appendix D: “Revision History”
2.0 PROGRAMMING OVERVIEW
When in development of a programming tool, it is
necessary to understand the internal Flash program
operations of the target device and the Special
Function Registers (SFRs) used to control Flash
programming, as these same operations and registers
are used by an external programming tool and its
software. These operations and control registers are
described in the “Flash Program Memory” chapter in
the specific device data sheet, and the related “PIC32
Family Reference Manual” section. It is highly
recommended that these documents be used in
conjunction with this programming specification.
An external tool programming setup consists of an
external programmer tool and a target PIC32 device.
Figure 2-1 illustrates a typical programming setup. The
programmer tool is responsible for executing
necessary programming steps and completing the
programming operation.
FIGURE 2-1: PROGRAMMING SYSTEM
SETUP
Target PIC32 Device
CPU
On-Chip Memory
External
Programmer
PIC32 Flash Programming Specification
PIC32
DS60001145AA-page 2 2007-2021 Microchip Technology Inc.
2.1 Devices with Dual Flash Panel and
Dual Boot Regions
The PIC32MKXXXXXXD/E/F/K/L/M and PIC32MZ
families of devices incorporate several features useful
for field (self) programming of the device. These
features include dual Flash panels with dual boot
regions, an aliasing scheme for the boot regions
allowing automatic selection of boot code at start-up
and a panel swap feature for Program Flash. The two
Flash panels and their associated boot regions can be
erased and programmed separately. Refer to the
Section 48. “Memory Organization and
Permissions” (DS60001214) of the “PIC32 Family
Reference Manual” for a detailed explanation of these
features.
A development tool used for production programming
will not be concerned about most of these features with
the following exceptions:
• Ensuring the SWAP bit (NVMCON[7]) is in the
proper setting. The default setting is ‘0’ for no swap
of panels. The development tool should assume the
default setting when generating source files for the
programming tool.
• Proper handling of the aliasing of the boot memory
in the checksum calculation. The aliased sections
will be duplicates of the fixed sections. See
Section 18.0 “Checksum” for more information on
checksum calculations with aliased regions
• For PIC32MK devices, using the Erase/Retry
feature when an attempt to erase a Flash page fails
and needs to be retried. See Section 13.0
“Initiating a Page Erase” for more information.
2.2 Programming Interfaces
All PIC32 devices provide two physical interfaces to the
external programmer tool:
• 2-wire In-Circuit Serial Programming™ (ICSP™)
• 4-wire Joint Test Action Group (JTAG)
See Section 4.0 “Connecting to the Device” for
more information.
Either of these methods may use a downloadable
Programming Executive (PE). The PE executes from
the target device RAM and hides device programming
details from the programmer. It also removes overhead
associated with data transfer and improves overall data
throughput. Microchip has developed a PE that is
available for use with any external programmer, see
Section 17.0 “The Programming Executive” for
more information.
Section 3.0 “Programming Steps” describes high-
level programming steps, followed by a brief
explanation of each step. Detailed explanations are
available in corresponding sections of this document.
More information on programming commands, EJTAG,
and DC specifications are available in the following
sections:
•Section 19.0 “Configuration Memory and
Device ID”
•Section 20.0 “TAP Controllers”
•Section 21.0 “AC/DC Characteristics and
Timing Requirements”
2.3 Enhanced JTAG (EJTAG)
The 2-wire and 4-wire interfaces use the EJTAG
protocol to exchange data with the programmer. While
this document provides a working description of this
protocol as needed, advanced users are advised to
refer to the Imagination Technologies Limited web site
(www.imgtec.com) for more information.
2.4 Data Sizes
Data sizes are defined as follows:
• One word: 32 bits
• One-half word: 16 bits
• One-quarter word: 8 bits
• One Byte: 8 bits

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