Freescale Semiconductor MPC5200B - Manual (Page 161)

MPC5200B Users Guide, Rev. 1
7-2 Freescale Semiconductor
Interrupt Controller
Table 7-1 does not include machine-check bus errors or transaction handshaking. e300 core interrupt pins given in Section 7.2.1.1, Machine
Check Pin—core_mcp through Section 7.2.1.3, Standard Interrupt—core_int show e300 core interrupt priority.
7.2.1.1 Machine Check Pin—core_mcp
NOTE
The core_mcp pin is not used. Bus errors occur on the XL bus, thus generating an internal
machine-check exception, or are reflected as a normal interrupt from the offending source module.
Internally, bus errors (TEA, APE, DPE, etc.) cause a machine check exception to a single exception vector. This pin allows additional, external
to the e300 core, interrupts of the same type, but is not connected in this device.
7.2.1.2 System Management Interrupt—core_smi
The core_smi is a e300 core pin for high priority interrupts. Table 7-2 defines the interrupts.
7.2.1.3 Standard Interrupt—core_int
Identical to core_smi, but of lower priority. This interrupt is shared by a variety of internal low priority interrupts such as GPIO and RTC
functions. Some programmable connection are provided.
Table 7-3 gives a summary of the interrupt pins. Figure 7-2 shows the interrupt
sources and e300 core pins.
Table 7-2. System Management Interrupt Pin Interrupts
Interrupt Description
Enables The MSR[ee] bit must be set to enable interrupts at this e300 core pin. The MSR[ee] bit is
automatically cleared when an interrupt occurs. Therefore, the exception handler must re-set
this bit when interrupt is cleared.
Recovery/Status Recovery is highly dependant on system and software design. Where multiple sources are tied
to the same interrupt, a status register is provided to distinguish the interrupting source.
Timing Assertion of this interrupt is persistent (i.e., interrupt remains until cleared). If other interrupts
are pending when first interrupt is cleared, the core_smi pin should remain asserted for
handling once the current exception handler re-sets the MSR[ee] bit.
Connections Standard external and internal interrupts can be connected to this high priority interrupt. Slice
timer 1 is a dedicated connection.
Table 7-3. e300 core Interrupt Pins Summary
Pin Description Sources To Enable Timing
core_mcp Machine Check Pin Tied inactive — —
core_cint Critical Interrupt BestComm HI, IRQ0,
Slice Timer 0, CCS WakeUp
MSR[ce] Persistent
(remains until cleared)
core_smi System Management
Interrupt
Slice Timer 1,
Programmable interrupts
MSR[ee] Persistent
core_int Standard Interrupt Programmable interrupts MSR[ee] Persistent