PIC18F2431-E/MM Microchip Technology, PIC18F2431-E/MM Datasheet - Page 22

• Manufacturer Part Number: PIC18F2431-E/MM
• Description: 16 KB Flash, 768 RAM, 22 I/O 28 QFN-S 6x6m TUBE
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F2431-E/MM

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PIC18F2431-E/ML; PIC18F2431-E/ML

PIC18F2331/2431/4331/4431
4.2
The verify step involves reading back the code memory
space and comparing against the copy held in the pro-
grammer’s buffer. Memory reads occur a single byte at
a time, so two bytes must be read to compare against
the word in the programmer’s buffer. Refer to
Section 4.1 for implementation details of reading code
memory.
FIGURE 4-2:
DS30500B-page 22
Verify Code Memory and ID
Locations
No
Read High byte
Set Pointer = 0
Read Low Byte
Word = Expect
Code Memory
VERIFY CODE MEMORY FLOW
Verified?
Data?
Does
Start
All
Yes
Yes
No
Failure,
Report
Error
The table pointer must be manually set to 200000h
(base address of the ID locations) once the code mem-
ory has been verified. The post-increment feature of
the table read 4-bit command may not be used to incre-
ment the table pointer beyond the code memory space.
In a 16-Kbyte device, for example, a post-increment
read of address 3FFFh will wrap the table pointer back
to 0000h, rather than point to unimplemented address
4000h.
No
Set Pointer = 200000h
Read High byte
Read Low Byte
Word = Expect
ID Locations
Verified?
Data?
Does
Done
All
Yes
Yes
 2010 Microchip Technology Inc.
No
Failure,
Report
Error