PIC18F4423T-I/ML Microchip Technology, PIC18F4423T-I/ML Datasheet - Page 21
![16KB, Flash, 768bytes-RAM, 36I/O, 8-bit Family,nanoWatt 44 QFN 8x8x0.9mm T/R](/photos/6/81/68122/150-44-qfn_sml.jpg)
PIC18F4423T-I/ML
Manufacturer Part Number
PIC18F4423T-I/ML
Description
16KB, Flash, 768bytes-RAM, 36I/O, 8-bit Family,nanoWatt 44 QFN 8x8x0.9mm T/R
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC18F2221-ISO.pdf
(46 pages)
2.PIC18F2423-ISP.pdf
(54 pages)
3.PIC18F2423-ISP.pdf
(8 pages)
4.PIC18F2423-ISP.pdf
(34 pages)
Specifications of PIC18F4423T-I/ML
Core Processor
PIC
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
36
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 13x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
PIC18F4423T-I/MLTR
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:
© 2005 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
PIC18F2423/2523/4423/4523
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 may not be used to
increment the Table Pointer beyond the code memory
space. In a 64-Kbyte device, for example, a
post-increment read of address FFFFh will wrap the
Table Pointer back to 000000h, rather than point to
unimplemented address 010000h.
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
DS39759A-page 21
Failure,
Report
Error