MC68020RC25E Freescale Semiconductor, MC68020RC25E Datasheet - Page 130

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MC68020RC25E

Manufacturer Part Number
MC68020RC25E
Description
IC MICROPROC 32-BIT 25MHZ 114PGA
Manufacturer
Freescale Semiconductor
Datasheet

Specifications of MC68020RC25E

Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
114-PGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Other names
Q1165253

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MC68020RC25E
Manufacturer:
MOT
Quantity:
28
The processor begins exception processing for a bus error by making an internal copy of
the current SR. The processor then enters the supervisor privilege level (by setting the S-
bit in the SR) and clears the T1 and T0 bits in the SR. The processor generates exception
vector number 2 for the bus error vector. It saves the vector offset, PC, and the internal
copy of the SR on the active supervisor stack. The saved PC value is the logical address
of the instruction that was executing at the time the fault was detected. This is not
necessarily the instruction that initiated the bus cycle since the processor overlaps
MOTOROLA
Freescale Semiconductor, Inc.
Figure 6-1. Reset Operation Flowchart
For More Information On This Product,
Go to: www.freescale.com
M68020 USER’S MANUAL
T1, T0 (SR)
I2–I0 (SR)
ENTRIES INVALIDATED
INSTRUCTION CACHE
PREFETCH 3 WORDS
BEGIN INSTRUCTION
FETCH VECTOR #0
FETCH VECTOR #1
M (SR)
SP (VECTOR #0)
PC (VECTOR #1)
S (SR)
CACR
VBR
OTHERWISE
OTHERWISE
OTHERWISE
EXECUTION
ENTRY
EXIT
1
0
0
$7
$00000000
$00000000
ADDRESS ERROR
BUS ERROR
BUS ERROR OR
BUS ERROR
EXIT
EXIT
EXIT
(DOUBLE BUS FAULT)
(DOUBLE BUS FAULT)
(DOUBLE BUS FAULT)
6- 5

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