MC68020 Motorola, MC68020 Datasheet - Page 141

• Manufacturer Part Number: MC68020
• Description: (MC68020 / MC68EC020) MICROPROCESSORS USERS MANUAL
• Manufacturer: Motorola

6-16
IN ANY ORDER
*
BUS CYCLES
Does not apply to the MC68EC020.
MAY OCCUR
INDIVIDUAL
THESE
Figure 6-5. Interrupt Exception Processing Flowchart
EXIT
OTHERWISE
END OF EXCEPTION PROCESSING
PC
– (SP)
M68020 USER’S MANUAL
DEPENDENT INFORMATION
ONCE PER INSTRUCTION
ACKNOWLEDGE CYCLE
– (SP)
EXECUTE INTERRUPT
PREFETCH 3 WORDS
FOR THE INTERRUPT
*
VECTOR TABLE ENTRY
*
IPEND ASSERTED
UPDATE I2–I0
T1, T0
– (SP) TEMP
NEGATE IPEND
TEMP
– (SP)
OTHER EXCEPTION
FORMAT WORD
M = 0
S
SR
PC
1
AT INSTRUCTION
0
BOUNDARY
M = 1
BEGIN EXECUTION OF THE INTERRUPT
HANDLER ROUTINE OR PROCESS A
HIGHER PRIORITY EXCEPTION
TEMP
M
SR
0
MOTOROLA