MC68HC908KX2 MOTOROLA [Motorola, Inc], MC68HC908KX2 Datasheet - Page 104

• Manufacturer Part Number: MC68HC908KX2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Internal Clock Generator Module (ICG)
7.4.2 Internal Clock Generator
Technical Data
104
VOLTAGE AND
ICGEN
REFERENCES
CURRENT
NAME
NAME
Figure 7-2. Internal Clock Generator Block Diagram
CONFIGURATION (OR MOR) REGISTER BIT
The internal clock generator, shown in
frequency base clock (IBASE), which operates at a nominal frequency
(f
an integer multiple of IBASE. This multiple is the ICG multiplier factor
(N), which is programmed in the ICG multiplier register (ICGMR). The
internal clock generator is turned off and the output clocks (IBASE and
ICLK) are held low when the internal clock generator enable signal
(ICGEN) is clear.
The internal clock generator contains:
TOP LEVEL SIGNAL
NOM
•
•
•
•
++
– –
–
+
) of 307.2 kHz
A digitally controlled oscillator
A modulo N divider
A frequency comparator, which contains voltage and current
references, a frequency to voltage converter, and comparators
A digital loop filter
Internal Clock Generator Module (ICG)
CLOCK GENERATOR
COMPARATOR
FREQUENCY
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
DIGITAL
FILTER
TRIM[7:0]
LOOP
25 percent, and an internal clock (ICLK) which is
CONTROLLED
OSCILLATOR
DIGITALLY
MODULO
DIVIDER
Figure
N[6:0]
N
NAME
NAME
7-2, creates a low
MODULE SIGNAL
REGISTER BIT
DSTG[7:0]
DDIV[3:0]
MOTOROLA
IBASE
FICGS
ICLK