PIC16LF1902-E/SS Microchip Technology, PIC16LF1902-E/SS Datasheet - Page 89
![3.5KB Flash, 128B RAM, LCD, 11x10b ADC, NanoWatt XLP 28 SSOP .209in TUBE](/photos/16/9/160971/ssop-28_sml.jpg)
PIC16LF1902-E/SS
Manufacturer Part Number
PIC16LF1902-E/SS
Description
3.5KB Flash, 128B RAM, LCD, 11x10b ADC, NanoWatt XLP 28 SSOP .209in TUBE
Manufacturer
Microchip Technology
Series
PIC® XLP™ 16Fr
Datasheet
1.PIC16LF1902-EMV.pdf
(240 pages)
Specifications of PIC16LF1902-E/SS
Processor Series
PIC16LF190x
Core
PIC
Data Bus Width
8 bit
Program Memory Type
Flash
Program Memory Size
2 KB
Data Ram Size
128 B
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
25
Number Of Timers
2
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Package / Case
SSOP-28
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
-
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
25
Eeprom Size
-
Ram Size
128 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
Lead Free Status / Rohs Status
Details
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10.3
When modifying existing data in a program memory
row, and data within that row must be preserved, it must
first be read and saved in a RAM image. Program
memory is modified using the following steps:
1.
2.
3.
4.
5.
6.
7.
2011 Microchip Technology Inc.
Load the starting address of the row to be
modified.
Read the existing data from the row into a RAM
image.
Modify the RAM image to contain the new data
to be written into program memory.
Load the starting address of the row to be
rewritten.
Erase the program memory row.
Load the write latches with data from the RAM
image.
Initiate a programming operation.
Modifying Flash Program Memory
Preliminary
FIGURE 10-7:
An image of the entire row read
The words to be modified are
changed in the RAM image
PIC16LF1902/3
must be stored in RAM
Modify Operation
Modify Operation
Erase Operation
Read Operation
use RAM image
Write Operation
Modify Image
Figure 10-2
Figure 10-4
Figure 10-5
(Figure x.x)
(Figure x.x)
(Figure x.x)
FLASH PROGRAM
MEMORY MODIFY
FLOWCHART
Start
End
DS41455B-page 89
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