Chapter 4 Interrupt (S12ZINTV0)
S12ZVHY/S12ZVHL Family Reference Manual Rev. 1.05
Freescale Semiconductor
137
4.4.3
Priority Decoder
The INT module contains a priority decoder to determine the relative priority for all interrupt requests
pending for the CPU.
A CPU interrupt vector is not supplied until the CPU requests it. Therefore, it is possible that a higher
priority interrupt request could override the original exception which caused the CPU to request the vector.
In this case, the CPU will receive the highest priority vector and the system will process this exception first
instead of the original request.
If the interrupt source is unknown (for example, in the case where an interrupt request becomes inactive
after the interrupt has been recognized, but prior to the vector request), the vector address supplied to the
CPU defaults to that of the spurious interrupt vector.
NOTE
Care must be taken to ensure that all exception requests remain active until
the system begins execution of the applicable service routine; otherwise, the
exception request may not get processed at all or the result may be a
spurious interrupt request (vector at address (vector base + 0x0001DC)).
4.4.4
Reset Exception Requests
The INT module supports one system reset exception request. The different reset types are mapped to this
vector (for details please refer to the Clock and Power Management Unit module (CPMU)):
1. Pin reset
2. Power-on reset
3. Low-voltage reset
4. Clock monitor reset request
5. COP watchdog reset request
4.4.5
Exception Priority
The priority (from highest to lowest) and address of all exception vectors issued by the INT module upon
request by the CPU are shown in
. Generally, all non-maskable interrupts have higher priorities
than maskable interrupts. Please note that between the four software interrupts (Unimplemented op-code
trap page1/page2 requests, SWI request, SYS request) there is no real priority defined since they cannot
occur simultaneously (the S12Z CPU executes one instruction at a time).
Table 4-8. Exception Vector Map and Priority
Vector Address
(1)
Source
0xFFFFFC
Pin reset, power-on reset, low-voltage reset, clock monitor reset, COP watchdog reset
(Vector base + 0x0001F8)
Unimplemented page1 op-code trap (SPARE) vector request
(Vector base + 0x0001F4)
Unimplemented page2 op-code trap (TRAP) vector request
(Vector base + 0x0001F0)
Software interrupt instruction (SWI) vector request
(Vector base + 0x0001EC)
System call interrupt instruction (SYS) vector request
Содержание MC9S12ZVHL32
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