MC9S12XDP512MAG Freescale, MC9S12XDP512MAG Datasheet - Page 610
MC9S12XDP512MAG
Manufacturer Part Number
MC9S12XDP512MAG
Description
Manufacturer
Freescale
Datasheet
1.MC9S12XDP512MAG.pdf
(1348 pages)
Specifications of MC9S12XDP512MAG
Cpu Family
HCS12
Device Core Size
16b
Frequency (max)
40MHz
Interface Type
CAN/I2C/SCI/SPI
Total Internal Ram Size
32KB
# I/os (max)
119
Number Of Timers - General Purpose
12
Operating Supply Voltage (typ)
2.5/5V
Operating Supply Voltage (max)
2.75/5.5V
Operating Supply Voltage (min)
2.35/3.15V
On-chip Adc
2(24-chx10-bit)
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Mounting
Surface Mount
Pin Count
144
Package Type
LQFP
Program Memory Type
Flash
Program Memory Size
512KB
Lead Free Status / RoHS Status
Compliant
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Chapter 16 Interrupt (S12XINTV1)
16.5
16.5.1
After system reset, software should:
16.5.2
The interrupt request priority level scheme makes it possible to implement priority based interrupt request
nesting for the I bit maskable interrupt requests handled by the CPU.
I bit maskable interrupt requests cannot be interrupted by other I bit maskable interrupt requests per
default. In order to make an interrupt service routine (ISR) interruptible, the ISR must explicitly clear the
I bit in the CCR (CLI). After clearing the I bit, I bit maskable interrupt requests with higher priority can
interrupt the current ISR.
An ISR of an interruptible I bit maskable interrupt request could basically look like this:
610
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•
•
•
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Initialize the interrupt vector base register if the interrupt vector table is not located at the default
location (0xFF10–0xFFF9).
Initialize the interrupt processing level configuration data registers (INT_CFADDR,
INT_CFDATA0–7) for all interrupt vector requests with the desired priority levels and the request
target (CPU or XGATE module). It might be a good idea to disable unused interrupt requests.
If the XGATE module is used, setup the XGATE interrupt priority register (INT_XGPRIO) and
configure the XGATE module (please refer the XGATE Block Guide for details).
Enable I maskable interrupts by clearing the I bit in the CCR.
Enable the X maskable interrupt by clearing the X bit in the CCR (if required).
I bit maskable interrupt requests can be interrupted by an interrupt request with a higher priority,
so that there can be up to seven nested I bit maskable interrupt requests at a time (refer to
Figure 16-14
Service interrupt, e.g., clear interrupt flags, copy data, etc.
Clear I bit in the CCR by executing the instruction CLI (thus allowing interrupt requests with
higher priority)
Process data
Return from interrupt by executing the instruction RTI
Initialization/Application Information
Initialization
Interrupt Nesting
for an example using up to three nested interrupt requests).
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor
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