PIC18LF2550T-I/SO Microchip Technology, PIC18LF2550T-I/SO Datasheet - Page 22
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PIC18LF2550T-I/SO
Manufacturer Part Number
PIC18LF2550T-I/SO
Description
IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,SOP,28PIN,PLASTIC
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 PIC18LF2550T-I/SO
Rohs Compliant
YES
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
24
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 10x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-SOIC (7.5mm Width)
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
24
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, DM163025, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 10 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
PIC18F2455/2550/4455/4550
10. Module: MSSP (SPI Master)
EXAMPLE 10:
DS80478A-page 22
TransmitSPI:
BCF
MOVF
MOVWF
BCF
CLRF
MOVF
MOVWF
BSF
WaitComplete:
BTFSS
BRA
In Section 19.3.5, “Master Mode,” the following
content is added:
When used in Timer2 Output/2 mode, the SPI bit
rate can be configured using the PR2 Period
register and the Timer2 prescaler.
To operate in this mode, firmware must first ini-
tialize and enable the Timer2 module before it
can be used with the MSSP. Once enabled, the
Timer2 module is free-running and mostly
independent of the MSSP module.
PIR1, SSPIF
SSPBUF, W
RXDATA
T2CON, TMR2ON
TMR2
TXDATA, W
SSPBUF
T2CON, TMR2ON
PIR1, SSPIF
WaitComplete
LOADING SSPBUF WITH THE TIMER2/2 CLOCK MODE
;Make sure interrupt flag is clear (may have been set from previous
;transmission)
;Perform read, even if the data in SSPBUF is not important
;Save previously received byte in user RAM, if the data is meaningful
;Turn off timer when loading SSPBUF
;Set timer to a known state
;WREG = Contents of TXDATA (user data to send)
;Load data to send into transmit buffer
;Start timer to begin transmission
;Loop until data has finished transmitting
;Interrupt flag set when transmit is complete
Writing to the SSPBUF register will not clear the
current TMR2 value in hardware. This can result
in an unpredictable SPI transmit MSb bit width,
depending on how close the TMR2 register was
to the PR2 match condition at the moment that
the firmware wrote to SSPBUF.
To avoid the unpredictable MSb bit width, initial-
ize the TMR2 register to a known value when
writing to SSPBUF. An example procedure,
which provides predictable bit widths (only
needed in the Timer2/2 mode), is given in
Example 10.
© 2009 Microchip Technology Inc.