PIC18F4585-H/PT Microchip Technology, PIC18F4585-H/PT Datasheet - Page 339
PIC18F4585-H/PT
Manufacturer Part Number
PIC18F4585-H/PT
Description
IC MCU 8BIT 48KB FLASH 44TQFP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheet
1.PIC18F4585-IPT.pdf
(482 pages)
Specifications of PIC18F4585-H/PT
Core Processor
PIC
Core Size
8-Bit
Speed
25MHz
Connectivity
CAN, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
36
Program Memory Size
48KB (24K 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 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 150°C
Package / Case
44-TQFP
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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FIGURE 23-6:
FIGURE 23-7:
23.11 Programming Time Segments
Some requirements for programming of the time
segments:
• Prop_Seg + Phase_Seg 1 ≥ Phase_Seg 2
• Phase_Seg 2 ≥ Sync Jump Width.
For example, assume that a 125 kHz CAN baud rate is
desired, using 20 MHz for F
a baud rate prescaler value of 04h gives a T
To obtain a Nominal Bit Rate of 125 kHz, the Nominal
Bit Time must be 8 μs or 16 T
Using 1 T
and 7 T
point at 10 T
Phase Segment 2.
By the rules above, the Sync Jump Width could be the
maximum of 4 T
only necessary when the clock generation of the differ-
ent nodes is inaccurate or unstable, such as using
ceramic resonators. Typically, an SJW of 1 is enough.
© 2007 Microchip Technology Inc.
Input
Signal
Bit
Time
Segments
T
Q
T
Q
Q
for Phase Segment 1 would place the sample
Q
for the Sync_Seg, 2 T
Q
Sync
after the transition. This leaves 6 T
Sync
Q
. However, normally a large SJW is
LENGTHENING A BIT PERIOD (ADDING SJW TO PHASE SEGMENT 1)
SHORTENING A BIT PERIOD (SUBTRACTING SJW FROM PHASE SEGMENT 2)
Segment
Segment
Prop
OSC
Prop
Q
.
. With a T
Q
for the Prop_Seg
Nominal Bit Length
OSC
Actual Bit Length
Q
Segment 1
of 500 ns.
PIC18F2585/2680/4585/4680
of 50 ns,
Segment 1
Phase
Phase
Q
Preliminary
for
Nominal Bit Length
Actual Bit Length
Sample Point
23.12 Oscillator Tolerance
As a rule of thumb, the bit timing requirements allow
ceramic resonators to be used in applications with
transmission rates of up to 125 Kbit/sec. For the full bus
speed range of the CAN protocol, a quartz oscillator is
required. A maximum node-to-node oscillator variation
of 1.7% is allowed.
≤ SJW
Sample Point
Segment 2
Phase
Segment 2
Phase
DS39625C-page 337
≤ SJW
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