PIC18F6680-E/PT Microchip Technology, PIC18F6680-E/PT Datasheet - Page 338
PIC18F6680-E/PT
Manufacturer Part Number
PIC18F6680-E/PT
Description
IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,TQFP,64PIN,PLASTIC
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PCM18XK1.pdf
(496 pages)
3.PIC18F6585-IPT.pdf
(8 pages)
4.PIC18F6585-IPT.pdf
(38 pages)
5.PIC18F6585-IPT.pdf
(14 pages)
Specifications of PIC18F6680-E/PT
Rohs Compliant
YES
Core Processor
PIC
Core Size
8-Bit
Speed
25MHz
Connectivity
CAN, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
52
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
3.25K x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 16x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 125°C
Package / Case
64-TFQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F6680-E/PT
Manufacturer:
MPS
Quantity:
53
Company:
Part Number:
PIC18F6680-E/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
- PIC16F616T-ISL PDF datasheet
- PCM18XK1 PDF datasheet #2
- PIC18F6585-IPT PDF datasheet #3
- PIC18F6585-IPT PDF datasheet #4
- PIC18F6585-IPT PDF datasheet #5
- Current page: 338 of 496
- Download datasheet (9Mb)
PIC18F6585/8585/6680/8680
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 PIC18F6585/8585/6680/8680 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.
FIGURE 23-4:
DS30491C-page 336
Input
Signal
Bit
Time
Intervals
T
Baud Rate Setting
Q
Segment
BIT TIME PARTITIONING
Sync
Propagation
Segment
Q
).
Segment 1
Phase
Nominal Bit Time
The Nominal Bit Time is defined as:
EQUATION 23-1:
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
inal Bit Time is programmable from a minimum of 8 T
to a maximum of 25 T
Nominal Bit Time is 1 s, corresponding to a maximum
1 Mb/s rate. The actual duration is given by the
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
sponding oscillator period, and BRP is an integer (0
through 63) represented by the binary values of
BRGCON1<5:0>.
Nominal Bit Time = T
Sample Point
OSC
T
T
Q
Q
Q
is the clock frequency, T
( s) = (2 * (BRP+1))/F
(see Figure 23-4). By definition, the Nom-
( s) = (2 * (BRP+1)) * T
T
Phase_Seg1 + Phase_Seg2)
BIT
= 1/Nominal Bit Rate
Q
. Also by definition, the minimum
2004 Microchip Technology Inc.
Q
Segment 2
* (Sync_Seg + Prop_Seg +
or
Phase
OSC
OSC
OSC
(MHz)
( s)
is the corre-
Q
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