MC68HC908LK24 MOTOROLA [Motorola, Inc], MC68HC908LK24 Datasheet - Page 148
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MC68HC908LK24
Manufacturer Part Number
MC68HC908LK24
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908LK24.pdf
(465 pages)
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System Integration Module (SIM)
9.4.2.3 Illegal Opcode Reset
9.4.2.4 Illegal Address Reset
9.4.2.5 Low-Voltage Inhibit (LVI) Reset
9.4.2.6 Monitor Mode Entry Module Reset (MODRST)
Data Sheet
148
The SIM decodes signals from the CPU to detect illegal instructions. An
illegal instruction sets the ILOP bit in the SIM reset status register
(SRSR) and causes a reset.
If the stop enable bit, STOP, in the mask option register is logic 0, the
SIM treats the STOP instruction as an illegal opcode and causes an
illegal opcode reset. The SIM actively pulls down the RST pin for all
internal reset sources.
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. 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 V
the SIM reset status register (SRSR) is set, and the external reset pin
(RST) is held low while the SIM counter counts out 4096 + 32 ICLK
cycles. Thirty-two ICLK cycles later, the CPU is released from reset to
allow the reset vector sequence to occur. The SIM actively pulls down
the RST pin for all internal reset sources.
The monitor mode entry module reset (MODRST) asserts its output to
the SIM when monitor mode is entered in the condition where the reset
vectors are blank ($FF). (See
MODRST gets asserted, an internal reset occurs. The SIM actively pulls
down the RST pin for all internal reset sources.
Freescale Semiconductor, Inc.
For More Information On This Product,
DD
voltage falls to the LVI trip falling voltage, V
System Integration Module (SIM)
Go to: www.freescale.com
Section 10. Monitor ROM
MC68HC908LJ24/LK24 — Rev. 2
TRIPF
(MON).) When
. The LVI bit in
MOTOROLA
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