PIC32MX575F256LT-80I/PT Microchip Technology, PIC32MX575F256LT-80I/PT Datasheet - Page 18

• 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

PIC32MX
9.0
Before a device can be programmed, it must be
erased. The erase operation writes all ‘1s’ to the Flash
memory and prepares it to program a new set of data.
Once a device is erased, it can be verified by perform-
ing a “Blank Check” operation. See 9.1 “Blank Check”
for more information.
The procedure for erasing program memory (Program,
Boot, and Configuration memory) consists of selecting
the MTAP and sending the MCHP_ERASE command.
The programmer then must wait for the erase operation
to complete by reading and verifying bits in the
MCHP_STATUS value. Figure 9-1 illustrates the process
for performing a Chip Erase.
FIGURE 9-1:
DS61145G-page 18
Note:
ERASING THE DEVICE
The Device ID memory locations are read-
only and cannot be erased. Therefore,
Chip Erase has no effect on these memory
locations.
statusVal = XferData (MCHP_STATUS)
No
SendCommand (MTAP_SW_MTAP)
SendCommand (MTAP_COMMAND)
Put MTAP in Command Mode
Issue Chip Erase Command
XferData (MCHP_ERASE)
Read Erase Status
Select MTAP
ERASE DEVICE
CFGRDY = 1
FCBUSY = 0
Done
Yes
The following steps are required to erase a target
device:
1.
2.
3.
4.
5.
9.1
The term “Blank Check” implies verifying that the
device has been successfully erased and has no
programmed memory locations. A blank or erased
memory location always reads as ‘1’.
The device Configuration registers are ignored by the
Blank Check. Additionally, all unimplemented memory
space should be ignored from the Blank Check.
Note:
SendCommand (MTAP_SW_MTAP).
SendCommand (MTAP_COMMAND).
XferData (MCHP_ERASE).
statusVal = XferData (MCHP_STATUS).
If CFGRDY (statusVal<3>) is not ‘1’ and
FCBUSY (statusVal<4>) is not ‘0’, GOTO to
step 4.
Blank Check
The Chip Erase operation is a self-timed
operation. If the FCBUSY and CFGRDY
bits do not become properly set within the
specified Chip Erase time, the sequence
may have been executed wrong or the
device is damaged.
© 2010 Microchip Technology Inc.