MC68HC908GP32CP Freescale Semiconductor, MC68HC908GP32CP Datasheet - Page 116

• Manufacturer Part Number: MC68HC908GP32CP
• Description: IC MCU 8MHZ 32K FLASH 40-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908GP32CP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 33
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• For Use With: M68EVB908GP32 - BOARD EVALUATION FOR HC908GP32
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Clock Generator Module (CGMC)
Technical Data
114
4. Select a VCO frequency multiplier, N.
5. If N is < N
P, the power of two multiplier, and N, the range multiplier, are
integers.
In cases where desired bus frequency has some tolerance,
choose f
requirements (such as modules which are clocked by CGMXCLK),
cost requirements, or ideally, as high as the specified range
allows. See
reference divider, R = 1. After choosing N and P, the actual bus
frequency can be determined using equation in 2 above.
When the tolerance on the bus frequency is tight, choose f
an integer divisor of f
requirement, use the following equation to solve for R with
practical choices of f
lowest R.
Reduce N/R to the lowest possible R.
Then recalculate N:
Clock Generator Module (CGMC)
R
=
RCLK
round R
max
Section 23. Electrical
, use P = 0. If N > N
to a value determined either by other module
N max
N max
N max
N
MAX
N
Current N Value
=
0
×
×
=
RCLK
BUSDES
×
round
<
<
2
4
round



N
N
<
<



f
------------------------- -
≤
N
N
VCLKDES
≤
, and choose the f
N max
f



N max
≤
≤
MC68HC908GP32
RCLK
R
------------------------------------ -



N max
N max
, and R = 1. If f
R f
------------------------------------ -
×
f
×
RCLK
f
f
VCLKDES
RCLK
×
VCLKDES



max
2
×
×
–
×
4
8
integer
Specifications. Choose the
2
, choose P using this table:
P









•
RCLK
MC68HC08GP32
f
------------------------- -
RCLK
VCLKDES
P
0
1
2
3
f
RCLK
cannot meet this
that gives the






MOTOROLA
RCLK
—
Rev. 6
to