C8051F700DK Silicon Laboratories Inc, C8051F700DK Datasheet - Page 138
C8051F700DK
Manufacturer Part Number
C8051F700DK
Description
DEV KIT FOR C8051F700
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Datasheets
1.C8051F700-TB.pdf
(1 pages)
2.C8051F700-TB.pdf
(306 pages)
3.C8051F700-TB.pdf
(18 pages)
Specifications of C8051F700DK
Contents
Board, Cables, CD, Debugger, Power Supply
Processor To Be Evaluated
C8051F7x
Processor Series
C8051F7xx
Interface Type
USB
Operating Supply Voltage
3.3 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F7xx
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1635
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C8051F70x/71x
21.1. MCU Interrupt Sources and Vectors
The C8051F70x/71x MCUs support 16 interrupt sources. Software can simulate an interrupt by setting an
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 21.1. 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).
21.1.1. 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 or EIP1) 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 priority order is
used to arbitrate, given in Table 21.1.
21.1.2. 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 5
system clock cycles: 1 clock cycle to detect the interrupt and 4 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
18 system clock cycles: 1 clock cycle to detect the interrupt, 5 clock cycles to execute the RETI, 8 clock
cycles to complete the DIV instruction and 4 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.
138
Rev. 1.0
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