MC908GR16VFAE Freescale Semiconductor, MC908GR16VFAE Datasheet - Page 77

• Manufacturer Part Number: MC908GR16VFAE
• Description: IC MCU 16K FLASH 8MHZ 48-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC908GR16VFAE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: LIN, SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 37
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 48-LQFP
• Controller Family/series: HC08
• No. Of I/o's: 37
• Ram Memory Size: 1KB
• Cpu Speed: 8MHz
• No. Of Timers: 2
• Embedded Interface Type: SCI, SPI
• Rohs Compliant: Yes
• Processor Series: HC08GR
• Core: HC08
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 33
• Number Of Timers: 4
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: FSICEBASE, DEMO908GZ60E, M68CBL05CE, M68EML08GPGTE
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

Acquisition/Lock Time Specifications
4.8.2 Parametric Influences on Reaction Time
Acquisition and lock times are designed to be as short as possible while still providing the highest possible
stability. These reaction times are not constant, however. Many factors directly and indirectly affect the
acquisition time.
The most critical parameter which affects the reaction times of the PLL is the reference frequency, f
.
RDV
This frequency is the input to the phase detector and controls how often the PLL makes corrections. For
stability, the corrections must be small compared to the desired frequency, so several corrections are
required to reduce the frequency error. Therefore, the slower the reference the longer it takes to make
these corrections. This parameter is under user control via the choice of crystal frequency f
and the
XCLK
R value programmed in the reference divider. (See
4.3.3 PLL
Circuits,
4.3.6 Programming the
PLL, and
4.5.6 PLL Reference Divider Select
Register.)
Another critical parameter is the external filter network. The PLL modifies the voltage on the VCO by
adding or subtracting charge from capacitors in this network. Therefore, the rate at which the voltage
changes for a given frequency error (thus change in charge) is proportional to the capacitance. The size
of the capacitor also is related to the stability of the PLL. If the capacitor is too small, the PLL cannot make
small enough adjustments to the voltage and the system cannot lock. If the capacitor is too large, the PLL
may not be able to adjust the voltage in a reasonable time. (See
4.8.3 Choosing a
Filter.)
Also important is the operating voltage potential applied to V
. The power supply potential alters the
DDA
characteristics of the PLL. A fixed value is best. Variable supplies, such as batteries, are acceptable if
they vary within a known range at very slow speeds. Noise on the power supply is not acceptable,
because it causes small frequency errors which continually change the acquisition time of the PLL.
Temperature and processing also can affect acquisition time because the electrical characteristics of the
PLL change. The part operates as specified as long as these influences stay within the specified limits.
External factors, however, can cause drastic changes in the operation of the PLL. These factors include
noise injected into the PLL through the filter capacitor, filter capacitor leakage, stray impedances on the
circuit board, and even humidity or circuit board contamination.
4.8.3 Choosing a Filter
As described in
4.8.2 Parametric Influences on Reaction
Time, the external filter network is critical to the
stability and reaction time of the PLL. The PLL is also dependent on reference frequency and supply
voltage.
Figure 4-10
shows two types of filter circuits. In low-cost applications, where stability and reaction time of
the PLL are not critical, the three component filter network of
Figure 4-10
(B) can be replaced by a single
capacitor, C
, shown in
Figure 4-10
(A). Refer to
Table 4-4
for recommended filter components at various
F
reference frequencies. For reference frequencies between the values listed in the table, extrapolate to the
nearest common capacitor value. In general, a slightly larger capacitor provides more stability at the
expense of increased lock time.
MC68HC908GR16 Data Sheet, Rev. 5.0
Freescale Semiconductor
77