MC68302EH16C Freescale Semiconductor, MC68302EH16C Datasheet - Page 78
MC68302EH16C
Manufacturer Part Number
MC68302EH16C
Description
IC MPU MULTI-PROTOCOL 132-PQFP
Manufacturer
Freescale Semiconductor
Datasheets
1.MC68302AG20C.pdf
(4 pages)
2.MC68302AG20C.pdf
(2 pages)
3.MC68302AG20C.pdf
(13 pages)
4.MC68302EH16C.pdf
(481 pages)
Specifications of MC68302EH16C
Processor Type
M683xx 32-Bit
Speed
16MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
132-MQFP, 132-PQFP
Controller Family/series
68K
Core Size
32 Bit
Ram Memory Size
1152Byte
Cpu Speed
16MHz
No. Of Timers
3
Embedded Interface Type
SCP, TDM
Digital Ic Case Style
PQFP
Rohs Compliant
Yes
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
16MHz
Instruction Set Architecture
RISC
Supply Voltage 1 (typ)
5V
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
132
Package Type
PQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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- MC68302AG20C PDF datasheet
- MC68302AG20C PDF datasheet #2
- MC68302AG20C PDF datasheet #3
- MC68302EH16C PDF datasheet #4
- Current page: 78 of 481
- Download datasheet (2Mb)
System Integration Block (SIB)
3.2.5.4 Interrupt In-Service Register (ISR).
Each bit in the 16-bit ISR corresponds to an INRQ interrupt source. In a vectored interrupt
environment, the interrupt controller sets the ISR bit when the vector number corresponding
to the INRQ interrupt source is passed to the core during an interrupt acknowledge cycle.
The user's interrupt service routine should clear this bit during the servicing of the interrupt.
(If an event register exists for this peripheral, its bits should also be cleared by the user pro-
gram.) To clear a bit in the ISR, the user writes a one to that bit. The user can only clear bits
in this register, and bits that are written with zeros will not be affected. The ISR is cleared at
reset.
This register may be read by the user to determine which INRQ interrupts are currently being
processed. More than one bit in the ISR may be a one if the capability is used to allow higher
priority level 4 interrupts to interrupt lower priority level 4 interrupts. See 3.2.2.3 Nested In-
terrupts for more details.
The user can control the extent to which level 4 interrupts may interrupt other level 4 inter-
rupts by selectively clearing the ISR. A new INRQ interrupt will be processed if it has a higher
priority than the highest priority INRQ interrupt having its ISR bit set. Thus, if an INRQ inter-
rupt routine lowers the 3-bit mask in the M68000 core to level 3 and also clears its ISR bit
at the beginning of the interrupt routine, then a lower priority INRQ interrupt can interrupt it
as long as the lower priority is higher than any other ISR bits that are set.
If the INRQ error vector is taken, no bit in the ISR is set. Bit 0 of the ISR is always zero.
3.2.6 Interrupt Handler Examples
The following examples illustrate proper interrupt handling on the IMP. Nesting of level 4 in-
terrupts (a technique described earlier) is not implemented in the following examples.
Example 1—Timer 3 (Software Watchdog Timer) Interrupt Handler
Example 2— SCC1 Interrupt Handler
3-28
1. Vector to interrupt handler.
2. (Handle Event)
3. Clear the TIMER3 bit in the ISR.
4. Execute RTE instruction.
1. Vector to interrupt handler.
PB11
PB9
15
7
TIMER2
PB10
14
6
SCC1
SCP
13
5
MC68302 USER’S MANUAL
TIMER3
SDMA
12
4
SMC1
IDMA
11
3
SMC2
SCC2
10
2
TIMER1
PB8
9
1
MOTOROLA
SCC3
8
0
0
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