MAC7100CVF Motorola, MAC7100CVF Datasheet - Page 14

• Manufacturer Part Number: MAC7100CVF
• Description: MAC7100 Microcontroller Family Hardware Specifications
• Manufacturer: Motorola

Electrical Characteristics
3.8
This section describes the electrical characteristics for the oscillator, phase-locked loop, clock monitor and
reset generator.
3.8.1
The MAC7100 Family features an internal low power loop controlled Pierce oscillator and a full swing Pierce
oscillator/external clock mode. The selection of loop controlled Pierce oscillator or full swing Pierce
oscillator/external clock depends on the level of the XCLKS signal at the rising edge of the RESET signal.
Before asserting the oscillator to the internal system clock distribution subsystem, the quality of the
oscillation is checked for each start from either power on, STOP or oscillator fail. t
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 t
features a clock monitor. A Clock Monitor Failure is asserted if the frequency of the incoming clock signal
is below the Clock Monitor Assert Frequency f
1
2
3
4
14
Num C
H1a C Crystal oscillator range (loop controlled Pierce)
H1b C Crystal oscillator range (full swing Pierce)
H10 D External square wave fall time
H12 C EXTAL pin DC Operating Bias in loop controlled
H11 D Input Capacitance (EXTAL, XTAL pins)
H2
H3
H4
H5
H6
H7
H8
H9
Depending on the crystal; a damping series resistor might be necessary
XCLKS negated during reset
f
Maximum value is for extreme cases using high Q, low frequency crystals
osc
= 4 MHz, C = 22 pF.
C Oscillator start-up time (loop controlled Pierce)
D Clock Quality check time-out
D External square wave pulse width low
D External square wave pulse width high
D External square wave rise time
P Startup Current
P Clock Monitor Failure Assert Frequency
P External square wave input frequency
mode
Clock and Reset Generator Electrical
Characteristics
Oscillator Characteristics
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
MAC7100 Microcontroller Family Hardware Specifications
Freescale Semiconductor, Inc.
Rating
For More Information On This Product,
Table 17. Oscillator Characteristics
Go to: www.freescale.com
2
CMFA
1, 2
.
V
Symbol
t
t
UPOSC
CQOUT
f
t
t
t
DCBIAS
t
f
f
I
CMFA
EXTH
EXTR
f
EXTL
EXTF
OSC
OSC
OSC
C
EXT
IN
0.45
Min
100
4.0
0.5
0.5
9.5
9.5
—
50
—
—
—
—
TBD
TBD
Typ
100
—
—
—
—
—
—
—
—
—
7
UPOSC
3
CQOUT
. The device also
Max
50
200
2.5
16
40
—
40
—
—
—
—
1
1
MOTOROLA
specifies the
4
MHz
MHz
MHz
Unit
KHz
ms
µA
pF
ns
ns
ns
ns
V
s