
Electrical Characteristics
MC68HC912DT128A Rev 2.0
372
Electrical Characteristics
MOTOROLA
Table 80 CGM Characteristics
5.0 Volts +/- 10%
Characteristic
Symbol
Min.
Max.
Unit
PLL reference frequency, crystal oscillator range
(1)
f
REF
0.5
8
MHz
Bus frequency
f
BUS
0.004
8
MHz
VCO range
f
VCO
2.5
8
MHz
VCO Limp-Home frequency
f
VCOMIN
trk
Lock
unl
unt
0.5
2.5
MHz
Lock Detector transition from Acquisition to Tracking mode
3%
4%
—
Lock Detection
0%
1.5%
—
Un-Lock Detection
0.5%
2.5%
—
Lock Detector transition from Tracking to Acquisition mode
6%
8%
—
PLLON Stabilization delay
(2)
PLLON Total Stabilization delay
(3)
t
stab
3
ms
PLLON Acquisition mode stabilization delay
(3)
t
acq
1
ms
PLLON Tracking mode stabilization delay
(3)
t
al
2
ms
1. VDDPLL at VDD level.
2. PLL stabilization delay is highly dependent on operational requirement and external component values (e.e. crystal, XFC
filter component values). Note
(3)
shows typical delay values for a typical configuration. Appropriate XFC filter values
should be chosen based on operational requirement of system.
3. f
REF
= 4MHz, f
SYS
= 8MHz (REFDV = #$00, SYNR = #$01), XFC: Cs = 33nF, Cp - 3.3nF, Rs = 2.7K
.
Table 81 STOP Key Wake-up Filter
Characteristic
STOP Key Wake-Up Filter time
STOP Key Wake-Up Filter pulse interval
Symbol
t
KWSTP
t
KWSP
Min.
2
20
Max.
10
-
Unit
μ
s
μ
s