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MCP2510-ISO Datasheet(PDF) 49 Page - Microchip Technology |
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MCP2510-ISO Datasheet(HTML) 49 Page - Microchip Technology |
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49 / 80 page  © 2007 Microchip Technology Inc. DS21291F-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, RESET, 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 inter- nal 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 (CAN- CNTRL.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 M Ω. 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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Similar Description - MCP2510-ISO |
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