PIC32MX575F256LT-80I/PT Microchip Technology, PIC32MX575F256LT-80I/PT Datasheet - Page 27

• Manufacturer Part Number: PIC32MX575F256LT-80I/PT
• Description: 256KB Flash, 64KB RAM, 80 MHz, USB, 1xCAN, 8 DMA 100 TQFP 12x12x1mm T/R
• Manufacturer: Microchip Technology
• Series: PIC® 32MXr

Specifications of PIC32MX575F256LT-80I/PT

• Core Processor: MIPS32® M4K™
• Core Size: 32-Bit
• Speed: 80MHz
• Connectivity: CAN, I²C, SPI, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 2.3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

16.0
16.1
The programmer and the PE have a master-slave
relationship, where the programmer is the master
programming device and the PE is the slave.
All communication is initiated by the programmer in the
form of a command. The PE is able to receive only one
command at a time. Correspondingly, after receiving
and processing a command, the PE sends a single
response to the programmer.
16.1.1
In Enhanced ICSP mode, the PIC32MX family devices
operate from the internal Fast RC oscillator, which has
a nominal frequency of 8 MHz. To ensure that the pro-
grammer does not clock too fast, it is recommended
that a 1 MHz clock be provided by the programmer.
16.1.2
The programmer and the PE communicate using the
EJTAG Address, Data and Fastdata registers. In partic-
ular, the programmer transfers the command and data
to the PE using the Fastdata register. The programmer
receives a response from the PE using the Address
and Data registers. The pseudo operation of receiving
a response is shown in the GetPEResponse pseudo
operation below:
Format:
Purpose:
EXAMPLE 16-1:
© 2010 Microchip Technology Inc.
WORD GetPEResponse()
{
// Wait until CPU is ready
SendCommand(ETAP_CONTROL);
// Check if Processor Access bit (bit 18) is set
do {
} while( PrAcc(contorlVal<18>) is not ‘1’ );
// Select Data Register
SendCommand(ETAP_DATA);
// Receive Response
response = XferData(0);
// Tell CPU to execute instruction
SendCommand(ETAP_CONTROL);
XferData(32’h0x0000C000);
// return 32-bit response
return response;
}
response = GetPEResponse()
Enables the programmer to receive the 32-bit
response value from the PE.
controlVal=XferData(32’h0x0004C000 );
THE PROGRAMMING
EXECUTIVE
PE Communication
WORD response;
2-WIRE ICSP EJTAG RATE
COMMUNICATION OVERVIEW
GetPEResponse
EXAMPLE
The typical communication sequence between the
programmer and the PE is shown in Table 16-1.
The sequence begins when the programmer sends the
command and optional additional data to the PE, and
the PE carries out the command.
When the PE has finished executing the command, it
sends the response back to the programmer.
The response may contain more than one response.
For example, if the programmer sent a READ
command, the response will contain the data read.
TABLE 16-1:
16.2
The PE command set is shown in Table 16-3. This
table contains the opcode, mnemonic, length, time-out
and short description for each command. Functional
details on each command are provided in 16.2.3
“ROW_PROGRAM
“CHANGE_CFG Command”.
The PE sends a response to the programmer for each
command that it receives. The response indicates if the
command was processed correctly. It includes any
required response data or error data.
16.2.1
All PE commands have a general format consisting of
a 32-bit header and any required data for the command
(see Figure 16-1). The 32-bit header consists of a
16-bit opcode field, which is used to identify the com-
mand, a 16-bit command length field. The length field
indicates the number of bytes to be transferred, if any.
Operation
Step 1: Send command and optional data from
XferFastData
XferFastData..
Step 2: Programmer reads the response from the
GetPEResponse
GetPEResponse..
Note:
The PE Command Set
programmer to the PE.
PE.
COMMAND FORMAT
Some commands have no Length infor-
mation, however, the Length field must be
sent and the programming executive will
ignore the data.
COMMUNICATION
SEQUENCE FOR THE PE
Command”
Operand
(Command | data len)
optional data..
response
response..
PIC32MX
DS61145G-page 27
through
16.2.14