PIC18F23K20-E/ML Microchip Technology, PIC18F23K20-E/ML Datasheet - Page 25

• Manufacturer Part Number: PIC18F23K20-E/ML
• Description: 8 KB Enh Flash, 768 RAM, 25 I/O Pb Free, Nanowatt XLP 28 QFN 6x6mm TUBE
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F23K20-E/ML

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.2
The verify step involves reading back the code memory
space and comparing it against the copy held in the
programmer’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 “Read Code Memory, ID Locations and
Configuration Bits” for implementation details of
reading code memory.
FIGURE 4-2:
© 2009 Microchip Technology Inc.
Verify Code Memory and ID
Locations
No
with Post-increment
with Post-increment
Set TBLPTR = 0
Read High Byte
Read Low Byte
Word = Expect
code memory
verified?
data?
Does
VERIFY CODE MEMORY FLOW
Start
All
Yes
Yes
No
Failure,
Report
Error
Advance Information
Increment
Pointer
The Table Pointer must be manually set to 200000h
(base address of the ID locations) once the code
memory has been verified. The post-increment feature
of the table read 4-bit command can not be used to
increment the Table Pointer beyond the code memory
space. In a 64-Kbyte device, for example, a post-incre-
ment read of address FFFFh will wrap the Table Pointer
back to 000000h, rather than point to unimplemented
address 010000h.
PIC18F2XK20/4XK20
No
Set TBLPTR = 200000h
with Post-Increment
with Post-Increment
Read High byte
Read Low Byte
Word = Expect
ID locations
verified?
data?
Done
Does
All
Yes
Yes
No
DS41297F-page 25
Failure,
Report
Error