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HCS12 Datasheet(PDF) 334 Page - Freescale Semiconductor, Inc

Part # HCS12
Description  HCS12 Microcontrollers
PDF  452 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

HCS12 Datasheet(HTML) 334 Page - Freescale Semiconductor, Inc

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S12CPUV2 Reference Manual, Rev. 4.0
334
Freescale Semiconductor
cycle will have been a LAT cycle. After updating the instruction queue, clear
the is_full flag to indicate the fetch buffer is ready for new information.
Figure 8-4 shows the reset sequence and illustrates the relationship
between instruction cycle codes (VfPPP) and pipe status signals. One cycle
of the data bus is shown to indicate the relationship between the ALD data
movement code and the data value it refers to. The SEV execution start
code indicates that the reset vector pointed to an even address in this
example.
Figure 8-4. Reset Sequence for M68HC12
ALD
00
00
00
00
00
00
10
00
10
10
10
ALD
ALD
SEV
DM
EX
DM
DM
Vf
P
PP
INSTRUCTION
CYCLE CODES
E CLOCK
DATA BUS
IPIPE[1:0]
FIRST USER
INSTRUCTION



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