S12CPUV2D datasheet(106/126 Pages) FREESCALE

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MC9S12DJ64 Device User Guide — V01.17

106

A.5.1.5 Pseudo Stop and Wait Recovery

The recovery from Pseudo STOP and Wait are essentially the same since the oscillator was not stopped in

both modes. The controller can be woken up by internal or external interrupts. After twrs the CPU starts

fetching the interrupt vector.

A.5.2 Oscillator

The device features an internal Colpitts and Pierce oscillator. The selection of Colpitts oscillator or Pierce

oscillator/external clock depends on the XCLKS signal which is sampled during reset. Pierce

oscillator/external clock mode allows the input of a square wave. Before asserting the oscillator to the

internal system clocks the quality of the oscillation is checked for each start from either power-on, STOP

or oscillator fail. tCQOUT specifies the maximum time before switching to the internal self clock mode after

POR or STOP if a proper oscillation is not detected. The quality check also determines the minimum

oscillator start-up time tUPOSC. The device also features a clock monitor. A Clock Monitor Failure is

asserted if the frequency of the incoming clock signal is below the Assert Frequency fCMFA.

Table A-15 Oscillator Characteristics

Conditions are shown in Table A-4 unless otherwise noted

Num C

Rating

Symbol

Min

Typ

Max

Unit

C Crystal oscillator range (Colpitts)

fOSC

0.5

MHz

C Crystal oscillator range (Pierce) 1

fOSC

0.5

MHz

P Startup Current

iOSC

100

µA

C Oscillator start-up time (Colpitts)

tUPOSC

1003

D Clock Quality check time-out

tCQOUT

0.45

2.5

P Clock Monitor Failure Assert Frequency

fCMFA

100

200

KHz

6P External square wave input frequency 4

fEXT

0.5

MHz

D External square wave pulse width low

tEXTL

9.5

D External square wave pulse width high

tEXTH

9.5

D External square wave rise time

tEXTR

1ns

D External square wave fall time

tEXTF

1ns

D Input Capacitance (EXTAL, XTAL pins)

CIN

7pF

DC Operating Bias in Colpitts Conﬁguration on

EXTAL Pin

VDCBIAS

1.1

P EXTAL Pin Input High Voltage4

VIH,EXTAL

0.7*VDDPLL

T EXTAL Pin Input High Voltage4

VIH,EXTAL

VDDPLL+ 0.3

P EXTAL Pin Input Low Voltage4

VIL,EXTAL

0.3*VDDPLL

T EXTAL Pin Input Low Voltage4

VIL,EXTAL

VDDPLL - 0.3

C EXTAL Pin Input Hysteresis4

VHYS,EXTAL

250

S12CPUV2D 数据表(PDF) 106 Page - Freescale Semiconductor, Inc

S12CPUV2D 数据表(HTML) 106 Page - Freescale Semiconductor, Inc

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