参数资料
型号: EFM32G222F128
厂商: Energy Micro
文件页数: 51/136页
文件大小: 0K
描述: IC MCU 32BIT 128KB FLASH 48LQFP
特色产品: EFM32 Gecko
标准包装: 1
系列: Gecko
核心处理器: ARM? Cortex?-M3
芯体尺寸: 32-位
速度: 32MHz
连通性: I²C,IrDA,智能卡,SPI,UART/USART
外围设备: 欠压检测/复位,DMA,POR,PWM,WDT
输入/输出数: 37
程序存储器容量: 128KB(128K x 8)
程序存储器类型: 闪存
RAM 容量: 16K x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 3.8 V
数据转换器: A/D 4x12b,D/A 1x12b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 48-TQFP
包装: 标准包装
其它名称: 914-1027-6
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
21
www.energymicro.com
the word instructions LDREX and STREX
the halfword instructions LDREXH and STREXH
the byte instructions LDREXB and STREXB.
Software must use a Load-Exclusive instruction with the corresponding Store-Exclusive instruction.
To perform a guaranteed read-modify-write of a memory location, software must:
1. Use a Load-Exclusive instruction to read the value of the location.
2. Update the value, as required.
3. Use a Store-Exclusive instruction to attempt to write the new value back to the memory location, and
tests the returned status bit. If this bit is:
0
The read-modify-write completed successfully,
1
No write was performed. This indicates that the value returned at step 1 (p. 21) might be out
of date. The software must retry the read-modify-write sequence,
Software can use the synchronization primitives to implement a semaphores as follows:
1. Use a Load-Exclusive instruction to read from the semaphore address to check whether the
semaphore is free.
2. If the semaphore is free, use a Store-Exclusive to write the claim value to the semaphore address.
3. If the returned status bit from step 2 (p. 21) indicates that the Store-Exclusive succeeded then the
software has claimed the semaphore. However, if the Store-Exclusive failed, another process might
have claimed the semaphore after the software performed step 1 (p. 21) .
The Cortex-M3 includes an exclusive access monitor, that tags the fact that the processor has executed
a Load-Exclusive instruction.
The processor removes its exclusive access tag if:
It executes a CLREX instruction
It executes a Store-Exclusive instruction, regardless of whether the write succeeds.
An exception occurs. This means the processor can resolve semaphore conflicts between different
threads.
For more information about the synchronization primitive instructions, see Section 3.4.8 (p. 54) and
2.2.8 Programming hints for the synchronization primitives
ANSI C cannot directly generate the exclusive access instructions. Some C compilers provide intrinsic
functions for generation of these instructions:
Table 2.14. C compiler intrinsic functions for exclusive access instructions
Instruction
Intrinsic function
LDREX
, LDREXH, or
LDREXB
unsigned int __ldrex(volatile void *ptr)
STREX
, STREXH, or
STREXB
int __strex(unsigned int val, volatile
void *ptr)
CLREX
void __clrex(void)
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 require LDREXB operation:
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