MC9S08GB60 Datasheet, PDF (272/290 Pages) Motorola, Inc – Microcontrollers

Appendix A Electrical Characteristics
Table A-9. ICG Frequency Specifications (continued)
(V_DDA = V_DDA (min) to V_DDA (max), Temperature Range = –40 to 85°C Ambient)
Characteristic
Symbol
Min
Typical
Max
Unit
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
Minimum DCO clock (ICGDCLK) frequency
f_ICGDCLKmin
8
—
MHz
Maximum DCO clock (ICGDCLK) frequency
Self-clock mode (ICGOUT) frequency ¹
f_ICGDCLKmax
—
40
MHz
f_Self
f_ICGDCLKmin
f_ICGDCLKmax MHz
Self-clock mode reset (ICGOUT) frequency
Loss of reference frequency ²
Low range
High range
Loss of DCO frequency ³
Crystal start-up time ^{4, 5}
Low range
High range
FLL lock time ^{4, 6}
Low range
High range
f_{Self_reset}
5.5
f_LOR
5
50
f_LOD
0.5
t
CSTL
—
t
CSTH
—
t_Lockl
—
t_Lockh
—
8
10.5
MHz
25
500
kHz
1.5
MHz
430
4
—
—
ms
2
ms
2
FLL frequency unlock range
n_Unlock
–4*N
4*N
counts
FLL frequency lock range
n_Lock
–2*N
2*N
counts
ICGOUT period jitter, ^{4, 7} measured at f_ICGOUT Max
Long term jitter (averaged over 2 ms interval)
C_Jitter
—
0.2
% f_ICG
Internal oscillator deviation from trimmed frequency ⁸
V_DD = 1.8 – 3.6 V, (constant temperature)
V_DD = 3.0 V ±10%, –40° C to 85° C
ACC_int
—
—
± 0.5
±0.5
±2
%
±2
1 _{Self-clocked mode frequency is the frequency that the DCO generates when the FLL is open-loop.}
2 _{Loss of reference frequency is the reference frequency detected internally, which transitions the ICG into self-clocked}
mode if it is not in the desired range.
3 _{Loss of DCO frequency is the DCO frequency detected internally, which transitions the ICG into FLL bypassed external}
mode (if an external reference exists) if it is not in the desired range.
4 _{This parameter is characterized before qualification rather than 100% tested.}
5 _{Proper PC board layout procedures must be followed to achieve specifications.}
6 _{This specification applies to the period of time required for the FLL to lock after entering FLL engaged internal or external}
modes. If a crystal/resonator is being used as the reference, this specification assumes it is already running.
7 _{Jitter is the average deviation from the programmed frequency measured over the specified interval at maximum fICGOUT.}
Measurements are made with the device powered by filtered supplies and clocked by a stable external clock signal. Noise
injected into the FLL circuitry via V_DDA and V_SSA and variation in crystal oscillator frequency increase the C_Jitter
percentage for a given interval.
8 _{See Figure A-10}
MC9S08GB/GT Data Sheet, Rev. 2.3
272
Freescale Semiconductor