PIC16LF1903T-I/SO Microchip Technology, PIC16LF1903T-I/SO Datasheet - Page 83

• Manufacturer Part Number: PIC16LF1903T-I/SO
• Description: 7KB Flash, 256B RAM, LCD, 11x10b ADC, NanoWatt XLP 28 SOIC .300in T/R
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16LF1903T-I/SO

• Processor Series: PIC16LF190x
• Core: PIC
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 4 KB
• Data Ram Size: 256 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: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-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: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / Rohs Status: Details

10.2.3
While executing code, program memory can only be
erased by rows. To erase a row:
1.
2.
3.
4.
5.
See
After the “BSF PMCON1,WR” instruction, the processor
requires two cycles to set up the erase operation. The
user must place two NOP instructions after the WR bit is
set. The processor will halt internal operations for the
typical 2 ms erase time. This is not Sleep mode as the
clocks and peripherals will continue to run. After the
erase cycle, the processor will resume operation with
the third instruction after the PMCON1 WRITE instruc-
tion.
 2011 Microchip Technology Inc.
Load the PMADRH:PMADRL register pair with
any address within the row to be erased.
Clear the CFGS bit of the PMCON1 register.
Set the FREE and WREN bits of the PMCON1
register.
Write 55h, then AAh, to PMCON2 (Flash
programming unlock sequence).
Set control bit WR of the PMCON1 register to
begin the erase operation.
Example
ERASING FLASH PROGRAM
MEMORY
10-2.
Preliminary
FIGURE 10-4:
Program or Configuration Memory
Disable Write/Erase Operation
Enable Write/Erase Operation
PIC16LF1902/3
Erase operation completes
Select Erase Operation
(PMADRH:PMADRL)
Re-enable Interrupts
Select Row Address
Disable Interrupts
Unlock Sequence
Erase Operation
CPU stalls while
Erase Operation
(FIGURE x-x)
(2ms typical)
(WREN = 1)
(WREN = 0)
FLASH PROGRAM
MEMORY ERASE
FLOWCHART
(FREE = 1)
Figure 10-3
(GIE = 0)
(GIE = 1)
(CFGS)
Select
Start
End
DS41455B-page 83