3S12XDT256 데이터 시트보기 (PDF) - Freescale Semiconductor

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3S12XDT256

16-bit Microprocessor Family

Freescale Semiconductor 

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

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