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型號(hào)：	E5550F-DOW
廠商：	ATMEL CORP
元件分類(lèi)：	通信及網(wǎng)絡(luò)
英文描述：	SPECIALTY TELECOM CIRCUIT, UUC7
封裝：	DIE-7
文件頁(yè)數(shù)：	70/1069頁(yè)
文件大?。?/td>	14303K
代理商：	E5550F-DOW

SAM4CP [DATASHEET]

43051E–ATPL–08/14

12.4.2.8 Programming Hints for the Synchronization Primitives

ISO/IEC C cannot directly generate the exclusive access instructions. CMSIS provides intrinsic functions for generation

of these instructions:

The actual exclusive access instruction generated depends on the data type of the pointer passed to the intrinsic

function. For example, the following C code generates the required LDREXB operation:

__ldrex((volatile char *) 0xFF);

12.4.3 Exception Model

This section describes the exception model.

12.4.3.1 Exception States

Each exception is in one of the following states:

The exception is not active and not pending.

The exception is waiting to be serviced by the processor.

An interrupt request from a peripheral or from software can change the state of the corresponding interrupt to pending.

An exception is being serviced by the processor but has not completed.

An exception handler can interrupt the execution of another exception handler. In this case, both exceptions are in the

active state.

Active and Pending

The exception is being serviced by the processor and there is a pending exception from the same source.

12.4.3.2 Exception Types

The exception types are:

Reset is invoked on power up or a warm reset. The exception model treats reset as a special form of exception. When

reset is asserted, the operation of the processor stops, potentially at any point in an instruction. When reset is

deasserted, execution restarts from the address provided by the reset entry in the vector table. Execution restarts as

privileged execution in Thread mode.

Non Maskable Interrupt (NMI)

A non maskable interrupt (NMI) can be signalled by a peripheral or triggered by software. This is the highest priority

exception other than reset. It is permanently enabled and has a fixed priority of -2.

CMSIS Functions for Exclusive Access Instructions

CMSIS Function

uint32_t __LDREXW (uint32_t *addr)

uint16_t __LDREXH (uint16_t *addr)

uint8_t __LDREXB (uint8_t *addr)

uint32_t __STREXW (uint32_t value, uint32_t *addr)

uint32_t __STREXH (uint16_t value, uint16_t *addr)

uint32_t __STREXB (uint8_t value, uint8_t *addr)

void __CLREX (void)

相關(guān)PDF資料	PDF描述
E5530H-230-S8	SPECIALTY TELECOM CIRCUIT, PDSO8
E5530H-230-DOW	SPECIALTY TELECOM CIRCUIT, UUC
ECM2A5C3A12-29.939MTR	QUARTZ CRYSTAL RESONATOR, 29.939 MHz
ECM2A5C3A32-34.400M	QUARTZ CRYSTAL RESONATOR, 34.4 MHz
ED1702N	NPN general purpose transistor

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
E5550F-S8	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-DIT	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-DOW	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-FP008	制造商:未知廠家制造商全稱:未知廠家功能描述:TRANSPONDER\|CMOS\|SOP\|8PIN\|PLASTIC
E5552	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder

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