PIC18LF4685-I/P Microchip Technology, PIC18LF4685-I/P Datasheet - Page 335
![IC PIC MCU FLASH 48KX16 40DIP](/photos/6/61/66192/150-40-dip_sml.jpg)
PIC18LF4685-I/P
Manufacturer Part Number
PIC18LF4685-I/P
Description
IC PIC MCU FLASH 48KX16 40DIP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PCM18XT0.pdf
(484 pages)
3.PIC18F2221-ISO.pdf
(46 pages)
4.PIC18F2682-ISP.pdf
(6 pages)
5.PIC18F2682-ISP.pdf
(4 pages)
Specifications of PIC18LF4685-I/P
Core Size
8-Bit
Program Memory Size
96KB (48K x 16)
Core Processor
PIC
Speed
40MHz
Connectivity
CAN, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
36
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
3.25K x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Controller Family/series
PIC18
No. Of I/o's
36
Eeprom Memory Size
1024Byte
Ram Memory Size
3.25KB
Cpu Speed
40MHz
No. Of Timers
4
Package
40PDIP
Device Core
PIC
Family Name
PIC18
Maximum Speed
40 MHz
Operating Supply Voltage
2.5|3.3|5 V
Data Bus Width
8 Bit
Number Of Programmable I/os
44
Interface Type
CAN/I2C/SPI/USART
On-chip Adc
11-chx10-bit
Number Of Timers
4
Core
PIC
Processor Series
PIC18LF
Maximum Clock Frequency
40 MHz
Data Ram Size
3.25 KB
Mounting Style
Through Hole
A/d Bit Size
10 bit
A/d Channels Available
11
Height
4.95 mm
Length
53.21 mm
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2 V
Width
14.73 mm
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18LF4685-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
Part Number:
PIC18LF4685-I/PT
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
- PIC16F616T-ISL PDF datasheet
- PCM18XT0 PDF datasheet #2
- PIC18F2221-ISO PDF datasheet #3
- PIC18F2682-ISP PDF datasheet #4
- PIC18F2682-ISP PDF datasheet #5
- Current page: 335 of 484
- Download datasheet (9Mb)
23.9
All nodes on a given CAN bus must have the same
nominal bit rate. The CAN protocol uses Non-Return-
to-Zero (NRZ) coding which does not encode a clock
within the data stream. Therefore, the receive clock
must be recovered by the receiving nodes and
synchronized to the transmitter’s clock.
As oscillators and transmission time may vary from
node to node, the receiver must have some type of
Phase Lock Loop (PLL) synchronized to data transmis-
sion edges to synchronize and maintain the receiver
clock. Since the data is NRZ coded, it is necessary to
include bit stuffing to ensure that an edge occurs at
least every six bit times to maintain the Digital Phase
Lock Loop (DPLL) synchronization.
The bit timing of the PIC18F2682/2685/4682/4685 is
implemented using a DPLL that is configured to syn-
chronize to the incoming data and provides the nominal
timing for the transmitted data. The DPLL breaks each
bit time into multiple segments made up of minimal
periods of time called the Time Quanta (T
Bus timing functions executed within the bit time frame,
such as synchronization to the local oscillator, network
transmission delay compensation and sample point
positioning, are defined by the programmable bit timing
logic of the DPLL.
All devices on the CAN bus must use the same bit rate.
However, all devices are not required to have the same
master oscillator clock frequency. For the different clock
frequencies of the individual devices, the bit rate has to
be adjusted by appropriately setting the baud rate
prescaler and number of Time Quanta in each segment.
The Nominal Bit Rate is the number of bits transmitted
per second, assuming an ideal transmitter with an ideal
oscillator, in the absence of resynchronization. The
nominal bit rate is defined to be a maximum of 1 Mb/s.
The Nominal Bit Time is defined as:
EQUATION 23-1:
FIGURE 23-4:
© 2009 Microchip Technology Inc.
Input
Signal
Bit
Time
Intervals
T
Baud Rate Setting
Q
T
BIT
= 1/Nominal Bit Rate
Segment
BIT TIME PARTITIONING
Sync
Sync
Propagation
Segment
Q
).
PIC18F2682/2685/4682/4685
Segment 1
Phase
Nominal Bit Time
The Nominal Bit Time can be thought of as being
divided into separate, non-overlapping time segments.
These segments (Figure 23-4) include:
• Synchronization Segment (Sync_Seg)
• Propagation Time Segment (Prop_Seg)
• Phase Buffer Segment 1 (Phase_Seg1)
• Phase Buffer Segment 2 (Phase_Seg2)
The time segments (and thus the Nominal Bit Time) are
in turn made up of integer units of time called Time
Quanta or T
Nominal Bit Time is programmable from a minimum of
8 T
minimum Nominal Bit Time is 1 μs, corresponding to a
maximum 1 Mb/s rate. The actual duration is given by
the following relationship.
EQUATION 23-2:
The Time Quantum is a fixed unit derived from the
oscillator period. It is also defined by the programmable
baud rate prescaler, with integer values from 1 to 64, in
addition to a fixed divide-by-two for clock generation.
Mathematically, this is:
EQUATION 23-3:
where F
corresponding oscillator period and BRP is an integer
(0 through 63) represented by the binary values of
BRGCON1<5:0>. The equation above refers to the
effective clock frequency used by the microcontroller. If,
for example, a 10 MHz crystal in HS mode is used, then
the F
10 MHz crystal is used in HSPLL mode, then the effective
frequency is F
Nominal Bit Time= T
Q
OSC
to a maximum of 25 T
Sample Point
OSC
T
T
= 10 MHz and T
Q
Q
(μs) = (2 * (BRP + 1))/F
(μs) = (2 * (BRP + 1)) * T
Q
OSC
is the clock frequency, T
(see Figure 23-4). By definition, the
= 40 MHz and T
Phase_Seg1 + Phase_Seg2)
Q
* (Sync_Seg + Prop_Seg +
Segment 2
or
Phase
OSC
Q
. Also by definition, the
= 100 ns. If the same
OSC
OSC
DS39761C-page 335
OSC
(MHz)
= 25 ns.
(μs)
OSC
is the
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