参数资料
型号: EFM32TG108F32
厂商: Energy Micro
文件页数: 133/136页
文件大小: 0K
描述: MCU 32BIT 32KB FLASH 24-QFN
特色产品: EFM32 Tiny Gecko
标准包装: 1
系列: Tiny Gecko
核心处理器: ARM? Cortex?-M3
芯体尺寸: 32-位
速度: 32MHz
连通性: EBI/EMI,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: 17
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
RAM 容量: 4K x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 3.8 V
数据转换器: A/D 2x12b,D/A 1x12b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 24-VQFN 裸露焊盘
包装: 标准包装
其它名称: 914-1032-6
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
96
www.energymicro.com
Bits
Name
Function
[2]
DISFOLD
When set to 1, disables IT folding. see Section 4.3.2.1 (p. 96) for more information.
[1]
DISDEFWBUF
When set to 1, disables write buffer use during default memory map accesses. This causes
all bus faults to be precise bus faults but decreases performance because any store to
memory must complete before the processor can execute the next instruction.
Note
This bit only affects write buffers implemented in the Cortex-M3 processor.
[0]
DISMCYCINT
When set to 1, disables interruption of load multiple and store multiple instructions. This
increases the interrupt latency of the processor because any LDM or STM must complete
before the processor can stack the current state and enter the interrupt handler.
4.3.2.1 About IT folding
In some situations, the processor can start executing the first instruction in an IT block while it is still
executing the IT instruction. This behavior is called IT folding, and improves performance, However, IT
folding can cause jitter in looping. If a task must avoid jitter, set the DISFOLD bit to 1 before executing
the task, to disable IT folding.
4.3.3 CPUID Base Register
The CPUID register contains the processor part number, version, and implementation information. See
the register summary in Table 4.12 (p. 94) for its attributes. The bit assignments are:
31
16 15
4 3
0
Im plem ent er
Revision
Part No
24 23
20 19
Variant
Const ant
Table 4.14. CPUID register bit assignments
Bits
Name
Function
[31:24]
Implementer
Implementer code:
0x41
= ARM
[23:20]
Variant
Variant number, the r value in the rnpn product revision identifier:
0x2
= r2pX
[19:16]
Constant
Reads as 0xF
[15:4]
PartNo
Part number of the processor:
0xC23
= Cortex-M3
[3:0]
Revision
Revision number, the p value in the rnpn product revision identifier:
0x0
= rXp0
0x1
= rXp1
4.3.4 Interrupt Control and State Register
The ICSR:
provides:
a set-pending bit for the Non-Maskable Interrupt (NMI) exception
set-pending and clear-pending bits for the PendSV and SysTick exceptions
indicates:
the exception number of the exception being processed
whether there are preempted active exceptions
the exception number of the highest priority pending exception
whether any interrupts are pending.
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