參數(shù)資料
型號(hào): FRONTPANEL2EK
廠(chǎng)商: Silicon Laboratories Inc
文件頁(yè)數(shù): 6/250頁(yè)
文件大?。?/td> 0K
描述: BOARD EVAL PROXIMITY F8XX SI1120
產(chǎn)品培訓(xùn)模塊: Si1102 & Si1120
標(biāo)準(zhǔn)包裝: 1
系列: QuickSense™
傳感器類(lèi)型: 觸摸,電容式
傳感范圍: 4 個(gè)按鈕/鍵
接口: USB
嵌入式: 是,MCU,8 位
已供物品: 板,線(xiàn)纜
已用 IC / 零件: C8051F800,Si1120
產(chǎn)品目錄頁(yè)面: 626 (CN2011-ZH PDF)
相關(guān)產(chǎn)品: 336-1820-1-ND - SENS IR PROXIMITY AMB LT 8-ODFN
其它名稱(chēng): 336-1816
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Rev. 1.0
103
C8051F80x-83x
18.1. MCU Interrupt Sources and Vectors
The C8051F80x-83x MCUs support 15 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 18.1. 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).
18.1.1. 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 18.1.
18.1.2. 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.
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