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An opcode fetch from an unmapped address generates an illegal address reset. The SIM verifies that the CPU is fetching an opcode prior to asserting the ILAD bit in the SIM reset status register (SRSR) and resetting the MCU to Copy MC68HC08GP32 MCU Memory Program. A data fetch from an unmapped address does not generate a reset. The SIM actively pulls down the RST pin for all internal reset sources.

The low-voltage inhibit module (LVI) asserts its output to the SIM when the VDD voltage falls to the trip voltage, VLVII. The LVI bit in the SIM reset status register (SRSR) is set, and the external reset pin (RST) is held low
while the SIM counter counts out 4096 CGMXCLK cycles. 64 CGMXCLK cycles later, the CPU is released from reset to allow the reset vector sequence to occur by Clone MC68HC08GP16 Microcontroller Embedded Program. The SIM actively pulls down the RST pin for all internal reset sources.

Copy MC68HC08GP32 MCU Memory Program

The SIM counter is used by the power-on reset module (POR) and in stop mode recovery to allow the oscillator time to stabilize before enabling the internal bus (IBUS) clocks. The SIM counter also serves as a prescaler for the computer operating properly (COP) module. The SIM counter overflow supplies the clock for the COP module in order to Freescale MC68HC908GT16 CPU Unlocking. The SIM counter is 13 bits long and is clocked by the falling edge of CGMXCLK.

The power-on reset (POR) module detects power applied to the MCU. At power-on, the POR circuit asserts the signal PORRST to Break IC code. Once the SIM is initialized, it enables the clock generation module (CGM) to drive the bus clock state machine.