MC68HC908KX2 MOTOROLA [Motorola, Inc], MC68HC908KX2 Datasheet - Page 100

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

Internal Clock Generator Module (ICG)
7.2 Introduction
Technical Data
100
7.5.6
7.5.6.1
7.5.6.2
7.5.6.3
7.5.7
7.6
7.6.1
7.6.2
7.7
7.7.1
7.7.2
7.7.3
7.7.4
7.8
7.8.1
7.8.2
7.8.3
7.8.4
7.8.5
The internal clock generator module (ICG) is used to create a stable
clock source for the microcontroller without using any external
components. The ICG generates the oscillator output clock
(CGMXCLK), which is used by the computer operating properly (COP),
low-voltage inhibit (LVI), and other modules. The ICG also generates the
clock generator output (CGMOUT), which is fed to the system
integration module (SIM) to create the bus clocks. The bus frequency will
be one-fourth the frequency of CGMXCLK and one-half the frequency of
CGMOUT. Finally, the ICG generates the timebase clock (TBMCLK),
which is used in the timebase module (TBM).
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
CONFIG or MOR Options. . . . . . . . . . . . . . . . . . . . . . . . . . . .127
Input/Output (I/O) Registers . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Internal Clock Generator Module (ICG)
Nominal Frequency Settling Time . . . . . . . . . . . . . . . . . . . 122
Trimming Frequency on the Internal Clock Generator . . . . 125
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126
External Clock Enable (EXTCLKEN) . . . . . . . . . . . . . . . . . 127
External Crystal Enable (EXTXTALEN) . . . . . . . . . . . . . . . 127
Slow External Clock (EXTSLOW) . . . . . . . . . . . . . . . . . . . 128
Oscillator Enable In Stop (OSCENINSTOP) . . . . . . . . . . . 128
ICG Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
ICG Multiplier Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .133
ICG Trim Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
ICG DCO Divider Register . . . . . . . . . . . . . . . . . . . . . . . . . 134
ICG DCO Stage Register . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Settling to Within 15 Percent . . . . . . . . . . . . . . . . . . . . . 123
Settling to Within 5 Percent . . . . . . . . . . . . . . . . . . . . . . 123
Total Settling Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
MOTOROLA