MC68020EH25E Freescale Semiconductor, MC68020EH25E Datasheet - Page 139
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MC68020EH25E
Manufacturer Part Number
MC68020EH25E
Description
IC MPU 32BIT 33MHZ 132-PQFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68020EH16E.pdf
(306 pages)
Specifications of MC68020EH25E
Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
132-MQFP, 132-PQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
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Manufacturer
Quantity
Price
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Part Number:
MC68020EH25E
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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level 6 interrupt is not processed. However, if the MC68020/EC020 is handling a level 7
interrupt (I2–I0 in the SR set to 111) and the external request is lowered to level 3 and
then raised back to level 7, a second level 7 interrupt is processed. The second level 7
interrupt is processed because the level 7 interrupt is transition sensitive. A level 7
interrupt is also generated by a level comparison if the request level and mask level are at
7 and the priority mask is then set to a lower level (with the MOVE to SR or RTE
instruction, for example). As shown in Figure 6-3 for level 6 interrupt request level and
mask level, this is the case for all interrupt levels.
Note that a mask value of 6 and a mask value of 7 both inhibit request levels of 1–6 from
being recognized. In addition, neither masks a transition to an interrupt request level of 7.
The only difference between mask values of 6 and 7 occurs when the interrupt request
level is 7 and the mask value is 7. If the mask value is lowered to 6, a second level 7
interrupt is recognized.
6-14
LEVEL 6 EXAMPLE
LEVEL 7 EXAMPLE
IF
IF
IF
IF STILL
IF
IF
IF
IF STILL
EXTERNAL IPL2–IPL0
001 ($6)
100 ($3)
001 ($6)
001 ($6)
100 ($3)
100 ($3)
000 ($7)
100 ($3)
000 ($7)
000 ($7)
Figure 6-3. Interrupt Recognition Examples
Freescale Semiconductor, Inc.
For More Information On This Product,
THEN
AND STILL
AND STILL
AND RTE SO THAT
THEN
AND STILL
AND STILL
AND RTE SO THAT
INTERRUPT PRIORITY MASK (I2–I0 IN SR)
M68020 USER’S MANUAL
Go to: www.freescale.com
101 ($5)
110 ($6)
110 ($6)
110 ($6)
101 ($5)
101 ($5)
111 ($7)
111 ($7)
111 ($7)
101 ($5)
INITIAL CONDITIONS
INITIAL CONDITIONS
THEN
THEN
AND
THEN
AND
THEN
THEN
THEN
LEVEL 6 INTERRUPT
NO ACTION
NO ACTION
LEVEL 6 INTERRUPT (LEVEL COMPARISON)
LEVEL 7 INTERRUPT
NO ACTION
NO ACTION
LEVEL 7 INTERRUPT (LEVEL COMPARISON)
ACTION
(LEVEL COMPARISON)
(TRANSITION)
(TRANSITION)
MOTOROLA
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