PIC18LF4550T-I/PT Microchip Technology, PIC18LF4550T-I/PT Datasheet - Page 137
![IC PIC MCU FLASH 16KX16 44TQFP](/photos/6/82/68251/c04-076_pt_sml.jpg)
PIC18LF4550T-I/PT
Manufacturer Part Number
PIC18LF4550T-I/PT
Description
IC PIC MCU FLASH 16KX16 44TQFP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PCM18XR1.pdf
(438 pages)
3.PIC18F2221-ISO.pdf
(46 pages)
4.PIC18F2455-ISO.pdf
(14 pages)
5.PIC18F2455-ISO.pdf
(8 pages)
6.PIC18F2455-ISO.pdf
(26 pages)
Specifications of PIC18LF4550T-I/PT
Core Processor
PIC
Core Size
8-Bit
Speed
48MHz
Connectivity
I²C, SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
35
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 13x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Processor Series
PIC18LF
Core
PIC
Data Bus Width
8 bit
Data Ram Size
2 KB
Interface Type
SPI, I2C, EAUSART
Maximum Clock Frequency
48 MHz
Number Of Programmable I/os
35
Number Of Timers
4
Operating Supply Voltage
2 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DV164136, DM163022
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 13 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18LF4550T-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
Part Number:
PIC18LF4550T-I/PT
Manufacturer:
MICROCHIP原装
Quantity:
20 000
- PIC16F616T-ISL PDF datasheet
- PCM18XR1 PDF datasheet #2
- PIC18F2221-ISO PDF datasheet #3
- PIC18F2455-ISO PDF datasheet #4
- PIC18F2455-ISO PDF datasheet #5
- PIC18F2455-ISO PDF datasheet #6
- Current page: 137 of 438
- Download datasheet (7Mb)
12.7
Following a Timer1 interrupt and an update to the
TMR1 registers, the Timer1 module uses a falling edge
on its clock source to trigger the next register update on
the rising edge. If the update is completed after the
clock input has fallen, the next rising edge will not be
counted.
If the application can reliably update TMR1 before the
timer input goes low, no additional action is needed.
Otherwise, an adjusted update can be performed
EXAMPLE 12-1:
© 2009 Microchip Technology Inc.
RTCinit
RTCisr
Considerations in Asynchronous
Counter Mode
MOVLW
MOVWF
CLRF
MOVLW
MOVWF
CLRF
CLRF
MOVLW
MOVWF
BSF
RETURN
BTFSC
BRA
BTFSS
BRA
BSF
BCF
INCF
MOVLW
CPFSGT secs
RETURN
CLRF
INCF
MOVLW
CPFSGT mins
RETURN
CLRF
INCF
MOVLW
CPFSGT hours
RETURN
CLRF
RETURN
IMPLEMENTING A REAL-TIME CLOCK USING A TIMER1 INTERRUPT SERVICE
80h
TMR1H
TMR1L
b’00001111’
T1CON
secs
mins
.12
hours
PIE1, TMR1IE
TMR1L,0
$-2
TMR1L,0
$-2
TMR1H, 7
PIR1, TMR1IF
secs, F
.59
secs
mins, F
.59
mins
hours, F
.23
hours
; Preload TMR1 register pair
; for 1 second overflow
; Configure for external clock,
; Asynchronous operation, external oscillator
; Initialize timekeeping registers
;
; Enable Timer1 interrupt
; Insert the next 4 lines of code when TMR1
; can not be reliably updated before clock pulse goes low
; wait for TMR1L to become clear
; (may already be clear)
; wait for TMR1L to become set
; TMR1 has just incremented
; If TMR1 update can be completed before clock pulse goes low
; Start ISR here
; Preload for 1 sec overflow
; Clear interrupt flag
; Increment seconds
; 60 seconds elapsed?
; No, done
; Clear seconds
; Increment minutes
; 60 minutes elapsed?
; No, done
; clear minutes
; Increment hours
; 24 hours elapsed?
; No, done
; Reset hours
; Done
PIC18F2455/2550/4455/4550
following a later Timer1 increment. This can be done
by monitoring TMR1L within the interrupt routine until it
increments, and then updating the TMR1H:TMR1L reg-
ister pair while the clock is low, or one-half of the period
of the clock source. Assuming that Timer1 is being
used as a Real-Time Clock, the clock source is a
32.768 kHz crystal oscillator; in this case, one-half
period of the clock is 15.25 μs.
The Real-Time Clock application code in Example 12-1
shows a typical ISR for Timer1, as well as the optional
code required if the update cannot be done reliably
within the required interval.
DS39632E-page 135
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