Datasheet

Chapter 3 Electrical Characteristics and Timing Specifications
MC9S08AC128 MCU Series Data Sheet, Rev. 4
Freescale Semiconductor 25
3.9.1 ICG Frequency Specifications
Table 3-11. ICG Frequency Specifications
(V
DDA
= V
DDA
(min) to V
DDA
(max), Temperature Range = –40 to 125C Ambient)
Num C Characteristic Symbol Min Typ
1
1
Typical values are based on characterization data at V
DD
= 5.0V, 25C unless otherwise stated.
Max Unit
1
Oscillator crystal or resonator (REFS = 1)
(Fundamental mode crystal or ceramic resonator)
Low range
High range
High Gain, FBE (HGO = 1,CLKS = 10)
High Gain, FEE (HGO = 1,CLKS = 11)
Low Power, FBE (HGO = 0, CLKS = 10)
Low Power, FEE (HGO = 0, CLKS = 11)
flo
fhi_byp
fhi_eng
flp_byp
flp_eng
32
1
2
1
2
—
—
—
100
16
10
8
8
kHz
MHz
MHz
MHz
MHz
2
Input clock frequency (CLKS = 11, REFS = 0)
Low range
High range
f
lo
f
hi_eng
32
2
—
—
100
10
kHz
MHz
3
Input clock frequency (CLKS = 10, REFS = 0)
f
Extal
0—40MHz
4
Internal reference frequency (untrimmed)
f
ICGIRCLK
182.25 243 303.75 kHz
5
Duty cycle of input clock (REFS = 0)
t
dc
40 — 60 %
6
Output clock ICGOUT frequency
CLKS = 10, REFS = 0
All other cases
f
ICGOUT
f
Extal
(min)
f
lo
(min)
—
—
f
Extal
(max)
f
ICGDCLKmax
(
max)
MHz
7 Minimum DCO clock (ICGDCLK) frequency
f
ICGDCLKmin
3— MHz
8 Maximum DCO clock (ICGDCLK) frequency
f
ICGDCLKmax
—40MHz
9 Self-clock mode (ICGOUT) frequency
2
2
Self-clocked mode frequency is the frequency that the DCO generates when the FLL is open-loop.
f
Self
f
ICGDCLKmin
f
ICGDCLKmax
MHz
10 Self-clock mode reset (ICGOUT) frequency
f
Self_reset
5.5 8 10.5 MHz
11
Loss of reference frequency
3
Low range
High range
f
LOR
5
50
25
500
kHz
12 Loss of DCO frequency
4
f
LOD
0.5 1.5 MHz
13
Crystal start-up time
5, 6
Low range
High range
t
CSTL
t
CSTH
—
—
430
4
—
—
ms
14
FLL lock time
, 7
Low range
High range
t
Lockl
t
Lockh
—
—
2
2
ms
15 FLL frequency unlock range
n
Unlock
–4*N 4*N counts
16 FLL frequency lock range
n
Lock
–2*N 2*N counts
17
ICGOUT period jitter,
, 8
measured at f
ICGOUT
Max
Long term jitter (averaged over 2 ms interval)
C
Jitter
—0.2
% f
ICG
18
Internal oscillator deviation from trimmed
frequency
9
V
DD
= 2.7 – 5.5 V, (constant temperature)
V
DD
= 5.0 V 10%, –40 C to 125C
ACC
int
—
—
0.5
0.5
2
2
%