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| MC68HC05X16 Datasheet, PDF (135/232 Pages) Freescale Semiconductor, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit | |||
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Freescale Semiconductor, Inc.
10
RESETS AND INTERRUPTS
10.1
Resets
The MC68HC05X32 can be reset in three ways: by the initial power-on reset function, by an active
low input to the RESET pin or by a computer operating properly (COP) watchdog reset. Any of
these resets will cause the program to go to its starting address, speciï¬ed by the contents of
memory locations $3FFE and $3FFF, and cause the interrupt mask bit in the condition code
register to be set.
tVDDR
VDD
VDD threshold (1-2V typical)
tOXOV
OSC1
tPORL
tCYC
Internal
processor clock
RESET
Internal
address bus
Internal
data bus
(Internal power-on reset)
3DFE
New
3FFE 3FFF PC
Reset sequence
New New Op
Mask options PCH PCL code
Program
execution
begins
(External hardware reset)
tRL(or tDOGL)
3DFE
3FFE
3FFF
New
PC
Reset sequence
Mask
options
New
PCH
New
PCL
Op
code
Program
execution
begins
10
Figure 10-1 Reset timing diagram
MC68HC05X16
RESETS AND INTERRUPTS
For More Information On This Product,
10-1
Go to: www.freescale.com
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