MCF51QM32VFM(2012) View Datasheet(PDF) - Freescale Semiconductor
Part Name
Description
Manufacturer
MCF51QM32VFM
(Rev.:2012)
(Rev.:2012)
Freescale Semiconductor
MCF51QM32VFM Datasheet PDF : 71 Pages
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6.3.2.2
Memories and memory interfaces
Oscillator frequency specifications
Table 16. Oscillator frequency specifications
Symbol
fosc_lo
fosc_hi_1
fosc_hi_2
fec_extal
tdc_extal
tcst
Description
Oscillator crystal or resonator frequency — low
frequency mode (MCG_C2[RANGE]=00)
Oscillator crystal or resonator frequency — high
frequency mode (low range)
(MCG_C2[RANGE]=01)
Oscillator crystal or resonator frequency — high
frequency mode (high range)
(MCG_C2[RANGE]=1x)
Input clock frequency (external clock mode)
Input clock duty cycle (external clock mode)
Crystal startup time — 32 kHz low-frequency,
low-power mode (HGO=0)
Crystal startup time — 32 kHz low-frequency,
high-gain mode (HGO=1)
Crystal startup time — 8 MHz high-frequency
(MCG_C2[RANGE]=01), low-power mode
(HGO=0)
Crystal startup time — 8 MHz high-frequency
(MCG_C2[RANGE]=01), high-gain mode
(HGO=1)
Min.
32
1
8
—
40
—
—
—
—
Typ.
—
—
—
—
50
750
250
0.6
1
Max.
40
8
Unit
kHz
MHz
Notes
32
MHz
50
MHz
1, 2
60
%
—
ms
3, 4
—
ms
—
ms
—
ms
1. Other frequency limits may apply when external clock is being used as a reference for the FLL or PLL.
2. When transitioning from FBE to FEI mode, restrict the frequency of the input clock so that, when it is divided by FRDIV, it
remains within the limits of the DCO input clock frequency.
3. Proper PC board layout procedures must be followed to achieve specifications.
4. Crystal startup time is defined as the time between the oscillator being enabled and the OSCINIT bit in the MCG_S register
being set.
6.4 Memories and memory interfaces
6.4.1 Flash (FTFL) electrical specifications
This section describes the electrical characteristics of the FTFL module.
6.4.1.1 Flash timing specifications — program and erase
The following specifications represent the amount of time the internal charge pumps are
active and do not include command overhead.
MCF51QM128 Data Sheet, Rev. 6, 01/2012.
Freescale Semiconductor, Inc.
27
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