MC908LJ24CPKE Freescale Semiconductor, MC908LJ24CPKE Datasheet - Page 119

• Manufacturer Part Number: MC908LJ24CPKE
• Description: IC MCU 8BIT 24K FLASH 80-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC908LJ24CPKE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, IRSCI, SPI
• Peripherals: LCD, LVD, POR, PWM
• Number Of I /o: 48
• Program Memory Size: 24KB (24K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor
4. Calculate N:
5. Calculate and verify the adequacy of the VCO and bus
The relationship between the VCO frequency, f
reference frequency, f
where N is the integer range multiplier, between 1 and 4095.
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.
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.
frequencies f
Clock Generator Module (CGM)
R
=
RCLK
round R
Section 24. Electrical
VCLK
to a value determined either by other module
N
MAX
and f
=
RCLK
BUSDES
×
round
f
f
RCLK



VCLK
VCLK
f
BUS



BUS
f
------------------------- -
VCLKDES
, and choose the f
f



RCLK
, is
.
R
------------------------------------ -
=
=
=
, and R = 1. If f
f
×
RCLK
2
----------- f
2
----------- f
---------- -
2
f
f
VCLK
P
P
R
R
P
VCLKDES
N
N
×



(
(
–
×
4
RCLK
RCLK
Specifications. Choose the
integer
2
P
Clock Generator Module (CGM)



)
)



RCLK
f
------------------------- -
RCLK
VCLKDES
f
RCLK
Functional Description
VCLK
cannot meet this
that gives the



, and the



Data Sheet
RCLK
119
to