MC68HC908AP8CB Freescale Semiconductor, MC68HC908AP8CB Datasheet - Page 87

• Manufacturer Part Number: MC68HC908AP8CB
• Description: IC MCU 8K FLASH 8MHZ 42SDIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908AP8CB

• 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: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K 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: 42-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

6.3.9 CGM External Connections
In its typical configuration, the CGM requires up to four external components.
Figure 6-3
Care should be taken with PCB routing in order to minimize signal cross talk and noise. (See
Acquisition/Lock Time Specifications
performance.)
6.4 I/O Signals
The following paragraphs describe the CGM I/O signals.
6.4.1 External Filter Capacitor Pin (CGMXFC)
The CGMXFC pin is required by the loop filter to filter out phase corrections. An external filter network is
connected to this pin. (See
6.4.2 PLL Analog Power Pin (V
V
potential as the V
Freescale Semiconductor
DDA
•
•
is a power pin used by the analog portions of the PLL. Connect the V
Bypass capacitor, C
Filter network
shows the external components for the PLL:
To prevent noise problems, the filter network should be placed as close to
the CGMXFC pin as possible, with minimum routing distances and no
routing of other signals across the network.
Route V
capacitors as close as possible to the package.
DD
Note: Filter network in box can be replaced with a 0.47µF capacitor, but will degrade stability.
pin.
DDA
BYP
Figure
carefully for maximum noise immunity and place bypass
MCU
Figure 6-3. CGM External Connections
0.22 µF
MC68HC908AP Family Data Sheet, Rev. 4
6-3.)
1 kΩ
DDA
for routing information, filter network and its effects on PLL
)
CGMXFC
NOTE
NOTE
10 nF
V
SSA
V
DDA
C
0.1 µF
BYP
DDA
V
DD
pin to the same voltage
6.8
I/O Signals
87