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MCP2510-IST Datasheet(PDF) 49 Page - Microchip Technology

Part # MCP2510-IST
Description  Stand-Alone CAN Controller with SPI Interface
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP2510-IST Datasheet(HTML) 49 Page - Microchip Technology

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 2000 Microchip Technology Inc.
Preliminary
DS21291C-page 49
MCP2510
8.0
OSCILLATOR
The MCP2510 is designed to be operated with a crystal
or ceramic resonator connected to the OSC1 and
OSC2 pins. The MCP2510 oscillator design requires
the use of a parallel cut crystal. Use of a series cut crys-
tal may give a frequency out of the crystal manufactur-
ers specifications. A typical oscillator circuit is shown in
Figure 8-1. The MCP2510 may also be driven by an
external clock source connected to the OSC1 pin as
shown in Figure 8-2 and Figure 8-3.
8.1
Oscillator Startup Timer
The MCP2510 utilizes an oscillator startup timer (OST),
which holds the MCP2510 in reset, to insure that the
oscillator has stabilized before the internal state
machine begins to operate. The OST maintains reset
for the first 128 OSC1 clock cycles after power up or
wake up from sleep mode occurs. It should be noted
that no SPI operations should be attempted until after
the OST has expired.
8.2
CLKOUT Pin
The clock out pin is provided to the system designer for
use as the main system clock or as a clock input for other
devices in the system. The CLKOUT has an internal
prescaler which can divide FOSC by 1, 2, 4 and 8. The
CLKOUT function is enabled and the prescaler is
selected via the CANCNTRL register (see Register 9-1).
The CLKOUT pin will be active upon system reset and
default to the slowest speed (divide by 8) so that it can be
used as the MCU clock. When sleep mode is requested,
the MCP2510 will drive sixteen additional clock cycles on
the CLKOUT pin before entering sleep mode. The idle
state of the CLKOUT pin in sleep mode is low. When the
CLKOUT function is disabled (CANCNTRL.CLKEN = ‘0’)
the CLKOUT pin is in a high impedance state.
The CLKOUT function is designed to guarantee that
thCLKOUT and tlCLKOUT timings are preserved when the
CLKOUT pin function is enabled, disabled, or the pres-
caler value is changed.
FIGURE 8-1:
Crystal/Ceramic Resonator Operation
FIGURE 8-2:
External Clock Source
C1
C2
XTAL
OSC2
RS
(1)
OSC1
RF
(2)
SLEEP
To internal logic
Note 1: A series resistor, RS, may be required for AT strip cut crystals.
Note 2: The feedback resistor, RF, is typically in the range of 2 to 10 MΩ.
clock from
external system
OSC1
OSC2
Open
(1)
Note 1: A resistor to ground may be used to reduce system noise. This may increase system current.
Note 2: Duty cycle restrictions must be observed (see Table 12-2).


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