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MC9S12GRMV1 Datasheet, PDF (42/1292 Pages) Freescale Semiconductor, Inc – MC9S12G Family Reference Manual and Data Sheet | |||
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Device Overview MC9S12G-Family
⢠Interrupt ï¬ag register for pin interrupts on ports P, J and AD
⢠Control register to conï¬gure IRQ pin operation
⢠Routing register to support programmable signal redirection in 20 TSSOP only
⢠Routing register to support programmable signal redirection in 100 LQFP package only
⢠Package code register preset by factory related to package in use, writable once after reset. Also
includes bit to reprogram routing of API_EXTCLK in all packages.
⢠Control register for free-running clock outputs
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1.3.5 Main External Oscillator (XOSCLCP)
⢠Loop control Pierce oscillator using a 4 MHz to 16 MHz crystal
â Current gain control on amplitude output
â Signal with low harmonic distortion
â Low power
â Good noise immunity
â Eliminates need for external current limiting resistor
â Transconductance sized for optimum start-up margin for typical crystals
â Oscillator pins can be shared w/ GPIO functionality
1.3.6 Internal RC Oscillator (IRC)
⢠Trimmable internal reference clock.
â Frequency: 1 MHz
â Trimmed accuracy over â40ËC to +125ËC ambient temperature range:
±1.0% for temperature option C and V (see Table A-4)
±1.3% for temperature option M (see Table A-4)
1.3.7 Internal Phase-Locked Loop (IPLL)
⢠Phase-locked-loop clock frequency multiplier
â No external components required
â Reference divider and multiplier allow large variety of clock rates
â Automatic bandwidth control mode for low-jitter operation
â Automatic frequency lock detector
â Conï¬gurable option to spread spectrum for reduced EMC radiation (frequency modulation)
â Reference clock sources:
â External 4â16 MHz resonator/crystal (XOSCLCP)
â Internal 1 MHz RC oscillator (IRC)
MC9S12G Family Reference Manual, Rev.1.23
44
Freescale Semiconductor
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