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C8051F380/1/2/3/4/5/6/7/C
16.1. MCU Interrupt Sources and Vectors
The C8051F380/1/2/3/4/5/6/7/C MCUs support several interrupt sources. Software can simulate an inter-
rupt by setting any interrupt-pending flag to logic 1. If interrupts are enabled for the flag, an interrupt
request will be generated and the CPU will vector to the ISR address associated with the interrupt-pending
flag. MCU interrupt sources, associated vector addresses, priority order and control bits are summarized in
Table 16.1. Refer to the datasheet section associated with a particular on-chip peripheral for information
regarding valid interrupt conditions for the peripheral and the behavior of its interrupt-pending flag(s).
16.1.1. Interrupt Priorities
Each interrupt source can be individually programmed to one of two priority levels: low or high. A low prior-
ity interrupt service routine can be preempted by a high priority interrupt. A high priority interrupt cannot be
preempted. Each interrupt has an associated interrupt priority bit in an SFR (IP, EIP1, or EIP2) used to
configure its priority level. Low priority is the default. If two interrupts are recognized simultaneously, the
interrupt with the higher priority is serviced first. If both interrupts have the same priority level, a fixed prior-
16.1.2. Interrupt Latency
Interrupt response time depends on the state of the CPU when the interrupt occurs. Pending interrupts are
sampled and priority decoded each system clock cycle. Therefore, the fastest possible response time is 6
system clock cycles: 1 clock cycle to detect the interrupt and 5 clock cycles to complete the LCALL to the
ISR. If an interrupt is pending when a RETI is executed, a single instruction is executed before an LCALL
is made to service the pending interrupt. Therefore, the maximum response time for an interrupt (when no
other interrupt is currently being serviced or the new interrupt is of greater priority) occurs when the CPU is
performing an RETI instruction followed by a DIV as the next instruction. In this case, the response time is
20 system clock cycles: 1 clock cycle to detect the interrupt, 6 clock cycles to execute the RETI, 8 clock
cycles to complete the DIV instruction and 5 clock cycles to execute the LCALL to the ISR. If the CPU is
executing an ISR for an interrupt with equal or higher priority, the new interrupt will not be serviced until the
current ISR completes, including the RETI and following instruction.
Note that the CPU is stalled during Flash write operations and USB FIFO MOVX accesses. Interrupt ser-
vice latency will be increased for interrupts occurring while the CPU is stalled. The latency for these situa-
tions will be determined by the standard interrupt service procedure (as described above) and the amount
of time the CPU is stalled.
16.2. Interrupt Register Descriptions
The SFRs used to enable the interrupt sources and set their priority level are described in this section.
Refer to the data sheet section associated with a particular on-chip peripheral for information regarding
valid interrupt conditions for the peripheral and the behavior of its interrupt-pending flag(s).
Rev. 1.4
119
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