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參數(shù)資料
| 型號(hào)： | PIC16C65B-20E/PT |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 80/184頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU OTP 4KX14 PWM 44TQFP |
| 標(biāo)準(zhǔn)包裝： | 160 |
| 系列： | PIC® 16C |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 20MHz |
| 連通性： | I²C，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 33 |
| 程序存儲(chǔ)器容量： | 7KB（4K x 14） |
| 程序存儲(chǔ)器類型： | OTP |
| RAM 容量： | 192 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4 V ~ 5.5 V |
| 振蕩器型： | 外部 |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 44-TQFP |
| 包裝： | 托盤 |
170
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
23.7.4
Fast Interrupt
23.7.4.1
Fast Interrupt Source
The interrupt source 0 is the only source which can raise a fast interrupt request to the processor except if fast forc-
ing is used. The interrupt source 0 is generally connected to a FIQ pin of the product, either directly or through a
PIO Controller.
23.7.4.2
Fast Interrupt Control
The fast interrupt logic of the AIC has no priority controller. The mode of interrupt source 0 is programmed with the
AIC_SMR0 and the field PRIOR of this register is not used even if it reads what has been written. The field SRC-
TYPE of AIC_SMR0 enables programming the fast interrupt source to be positive-edge triggered or negative-edge
triggered or high-level sensitive or low-level sensitive
Writing 0x1 in the AIC_IECR (Interrupt Enable Command Register) and AIC_IDCR (Interrupt Disable Command
Register) respectively enables and disables the fast interrupt. The bit 0 of AIC_IMR (Interrupt Mask Register) indi-
cates whether the fast interrupt is enabled or disabled.
23.7.4.3
Fast Interrupt Vectoring
The fast interrupt handler address can be stored in AIC_SVR0 (Source Vector Register 0). The value written into
this register is returned when the processor reads AIC_FVR (Fast Vector Register). This offers a way to branch in
one single instruction to the interrupt handler, as AIC_FVR is mapped at the absolute address 0xFFFF F104 and
thus accessible from the ARM fast interrupt vector at address 0x0000 001C through the following instruction:
LDR
PC,[PC,# -&F20]
When the processor executes this instruction it loads the value read in AIC_FVR in its program counter, thus
branching the execution on the fast interrupt handler. It also automatically performs the clear of the fast interrupt
source if it is programmed in edge-triggered mode.
23.7.4.4
Fast Interrupt Handlers
This section gives an overview of the fast interrupt handling sequence when using the AIC. It is assumed that the
programmer understands the architecture of the ARM processor, and especially the processor interrupt modes and
associated status bits.
Assuming that:
1.
The Advanced Interrupt Controller has been programmed, AIC_SVR0 is loaded with the fast interrupt ser-
vice routine address, and the interrupt source 0 is enabled.
2.
The Instruction at address 0x1C (FIQ exception vector address) is required to vector the fast interrupt:
LDR PC, [PC, # -&F20]
3.
The user does not need nested fast interrupts.
When nFIQ is asserted, if the bit “F” of CPSR is 0, the sequence is:
1.
The CPSR is stored in SPSR_fiq, the current value of the program counter is loaded in the FIQ link regis-
ter (R14_FIQ) and the program counter (R15) is loaded with 0x1C. In the following cycle, during fetch at
address 0x20, the ARM core adjusts R14_fiq, decrementing it by four.
2.
The ARM core enters FIQ mode.
3.
When the instruction loaded at address 0x1C is executed, the program counter is loaded with the value
read in AIC_FVR. Reading the AIC_FVR has effect of automatically clearing the fast interrupt, if it has
been programmed to be edge triggered. In this case only, it de-asserts the nFIQ line on the processor.
4.
The previous step enables branching to the corresponding interrupt service routine. It is not necessary to
save the link register R14_fiq and SPSR_fiq if nested fast interrupts are not needed.
5.
The Interrupt Handler can then proceed as required. It is not necessary to save registers R8 to R13
because FIQ mode has its own dedicated registers and the user R8 to R13 are banked. The other regis-
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| PIC16C65B-20I/L | 功能描述:8位微控制器 -MCU 7KB 192 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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| PIC16C65B-20I/P | 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C65 DIP40 |
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