MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 134

• Manufacturer Part Number: MC68HC908LJ12CPB
• Description: 8-bit microcontroller units
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

9.3.1 Bus Timing
9.3.2 Clock Start-up from POR or LVI Reset
MC68HC908LJ12
Freescale Semiconductor
STOP MODE CLOCK
ENABLE SIGNALS
FROM CONFIG2
OSC2
OSC1
—
Rev. 2.1
PHASE-LOCKED LOOP (PLL)
OSCILLATOR (OSC) MODULE
CGMRCLK
In user mode, the internal bus frequency is either the oscillator output
(CGMXCLK) divided by four, CGMXCLK divided by two, or the PLL
output (CGMPCLK) divided by four.
When the power-on reset module or the low-voltage inhibit module
generates a reset, the clocks to the CPU and peripherals are inactive
and held in an inactive phase until after the 4096 ICLK cycle POR
timeout has completed. The RST pin is driven low by the SIM during this
entire period. The IBUS clocks start upon completion of the timeout.
Figure 9-3. CGM Clock Signals
System Integration Module (SIM)
CGMOUT
SIMDIV2
CGMXCLK
ICLK
SYSTEM INTEGRATION MODULE
SIM COUNTER
÷ 2
TO RTC, ADC
System Integration Module (SIM)
GENERATORS
BUS CLOCK
USER MODE
MONITOR MODE
Technical Data
SIMOSCEN
PTC1
IT12
TO REST
OF MCU
IT23
TO REST
OF MCU
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