MC908AP32CFAE Freescale Semiconductor, MC908AP32CFAE Datasheet - Page 96

• Manufacturer Part Number: MC908AP32CFAE
• Description: IC MCU 32K FLASH 8MHZ 48-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC908AP32CFAE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, IRSCI, SCI, SPI
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 32
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Controller Family/series: HC08
• No. Of I/o's: 32
• Ram Memory Size: 2KB
• Cpu Speed: 8MHz
• No. Of Timers: 2
• Embedded Interface Type: I2C, SCI, SPI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Clock Generator Module (CGM)
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.
6.8.3 Choosing a Filter
As described in
stability and reaction time of the PLL. The PLL is also dependent on reference frequency and supply
voltage.
Either of the filter networks in
(CGMRCLK).
low-cost applications where stability is not critical.
96
Figure 6-10
6.8.2 Parametric Influences on Reaction
(a) is used for applications requiring better stability.
0.22 µF
Figure 6-10
1 kΩ
MC68HC908AP A-Family Data Sheet, Rev. 3
CGMXFC
(a)
Figure 6-10. PLL Filter
V
is recommended when using a 4MHz reference clock
SSA
10 nF
Time, the external filter network is critical to the
CGMXFC
V
SSA
(b)
0.22 µF
Figure 6-10
Freescale Semiconductor
(b) is used in