s908ey8ad4cfjer Freescale Semiconductor, Inc, s908ey8ad4cfjer Datasheet - Page 246

• Manufacturer Part Number: s908ey8ad4cfjer
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Electrical Specifications
20.9 Trimmed Accuracy of the Internal Clock Generator
The unadjusted frequency of the low-frequency base clock (IBASE), when the comparators in the
frequency comparator indicate zero error, can vary as much as ±25% due to process, temperature, and
voltage. The trimming capability exists to compensate for process affects. The remaining variation in
frequency is due to temperature, voltage, and change in target frequency (multiply register setting). These
affects are designed to be minimal, however variation does occur. Better performance is seen with lower
settings of N.
20.9.1 Trimmed Internal Clock Generator Characteristics
246
Absolute trimmed internal oscillator tolerance
Variation over temperature
Variation over voltage
1. These specifications concern long-term frequency variation. Each measurement is taken over a 1-ms period.
2. Absolute value of variation in ICG output frequency, trimmed at nominal V
3. Specification is characterized but not tested.
4. Variation in ICG output frequency for a fixed N and voltage
5. Variation in ICG output frequency for a fixed N
–40°C to 85°C
–40°C to 135°C
25°C
–40°C to 85°C
–40°C to 135°C
are allowed to vary for a single given setting of N.
(3), (5)
Characteristic
(3), (4)
MC68HC908EY16 • MC68HC908EY8 Data Sheet, Rev. 10
(1)
(2),(3)
Symbol
V
F
V
ar_temp
abs_tol
ar_volt
DD
Min
—
—
—
—
—
—
and temperature, as temperature and V
±2.0
±2.5
0.05
Typ
1.0
1.0
1.0
Freescale Semiconductor
±3.5
±5.0
Max
0.08
2.0
2.0
2.0
%/°C
Unit
%/V
%
DD