Features
• Loop control Pierce oscillator using a 0.5 MHz to 16 MHz crystal
• Option for full-swing Pierce without internal feedback resistor using a
0.5 MHz to 40 MHz crystal
• Current gain control on amplitude output
– Signal with low harmonic distortion
– Low power
– Good noise immunity
– Eliminates need for external current limiting resistor
• Transconductance sized for optimum start-up margin for typical
crystals
• Clock monitor
• Phase-locked-loop clock frequency multiplier
– Reference divider
– Automatic bandwidth control mode for low-jitter operation
– Automatic frequency lock detector
• Fast wakeup from STOP in self clock mode for power saving and
immediate program execution
• Computer operating properly (COP) watchdog with optional safety
window to initialize timeout counter
• Real time interrupt for task scheduling purposes or cyclic wakeup
from low power modes
• System reset generation
• 16 bit data
• Support for external WAIT input or internal wait cycles to adapt MCU
speed to peripheral speed requirements
• Up to four chip select outputs to select 16K, 1M, 2M and 4M byte
address spaces
• Supports glue-less interface to popular asynchronous RAMs and
Flash devices
• External address space 4M byte for data and program space
MC9S12XD Family, Rev. 2.14
4
Freescale Semiconductor