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| 型號(hào)： | ATMEGA16HVA-4CKU |
| 廠商： | Atmel |
| 文件頁(yè)數(shù)： | 149/196頁(yè) |
| 文件大小： | 0K |
| 描述： | MCU AVR 16K FLASH 4MHZ 36-LGA |
| 產(chǎn)品培訓(xùn)模塊： | MCU Product Line Introduction megaAVR Introduction |
| 標(biāo)準(zhǔn)包裝： | 364 |
| 系列： | AVR® ATmega |
| 核心處理器： | AVR |
| 芯體尺寸： | 8-位 |
| 速度： | 4MHz |
| 連通性： | SPI |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 7 |
| 程序存儲(chǔ)器容量： | 16KB（8K x 16） |
| 程序存儲(chǔ)器類(lèi)型： | 閃存 |
| EEPROM 大?。?/td> | 256 x 8 |
| RAM 容量： | 512 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 1.8 V ~ 9 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 5x12b |
| 振蕩器型： | 外部 |
| 工作溫度： | -20°C ~ 85°C |
| 封裝/外殼： | 36-LGA |
| 包裝： | 托盤(pán) |
| 配用： | ATSTK600-ND - DEV KIT FOR AVR/AVR32 ATSTK500-ND - PROGRAMMER AVR STARTER KIT |
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56
8024A–AVR–04/08
ATmega8HVA/16HVA
13. External Interrupts
13.1
Overview
The External Interrupts are triggered by the INT2:0 pins. Observe that, if enabled, the interrupts
will trigger even if the INT2:0 pins are configured as outputs. This feature provides a way of gen-
erating a software interrupt. The External Interrupts can be triggered by a falling or rising edge or
a low level. This is set up as indicated in the specification for the External Interrupt Control Reg-
ister – EICRA. When the external interrupt is enabled and is configured as level triggered, the
interrupt will trigger as long as the pin is held low. Interrupts are detected asynchronously. This
implies that these interrupts can be used for waking the part also from sleep modes other than
Idle mode. The I/O clock is halted in all sleep modes except Idle mode.
Note that if a level triggered interrupt is used for wake-up from Power-save mode, the changed
level must be held for some time to wake up the MCU. This makes the MCU less sensitive to
noise. The changed level is sampled twice by the ULP Oscillator clock. The period of the ULP
Oscillator is 7.8 s (nominal) at 25
°C. The MCU will wake up if the input has the required level
during this sampling or if it is held until the end of the start-up time. The start-up time is defined
by the SUT fuses as described in ”Clock Systems and their Distribution” on page 24. If the level
is sampled twice by the ULP Oscillator clock but disappears before the end of the start-up time,
the MCU will still wake up, but no interrupt will be generated. The required level must be held
long enough for the MCU to complete the wake up to trigger the level interrupt.
13.2
Register Description
13.2.1
EICRA – External Interrupt Control Register A
Bits 7,6 – RES: Reserved Bits
These bits are reserved in the ATmega8HVA/16HVA, and will always read as zero.
Bits 5:0 – ISC21, ISC20 - ISC01, ISC00: External Interrupt 2 - 0 Sense Control Bits
The External Interrupts 2 - 0 are activated by the external pins INT2:0 if the SREG I-flag and the
corresponding interrupt mask in the EIMSK is set. The level and edges on the external pins that
activate the interrupts are defined in Table 13-1. Edges on INT2..INT0 are registered asynchro-
nously. Pulses on INT2:0 pins wider than the minimum pulse width given in Table 29-2 will
generate an interrupt. Shorter pulses are not guaranteed to generate an interrupt. If low level
interrupt is selected, the low level must be held until the completion of the currently executing
instruction to generate an interrupt. If enabled, a level triggered interrupt will generate an inter-
rupt request as long as the pin is held low. When changing the ISCn bit, an interrupt can occur.
Therefore, it is recommended to first disable INTn by clearing its Interrupt Enable bit in the
EIMSK Register. Then, the ISCn bit can be changed. Finally, the INTn interrupt flag should be
cleared by writing a logical one to its Interrupt Flag bit (INTFn) in the EIFR Register before the
interrupt is re-enabled.
Bit
765
432
10
-
ISC21
ISC20
ISC11
ISC10
ISC01
ISC00
EICRA
Read/Write
R
R/W
Initial Value
0
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| ATMEGA16HVA-4CKUR | 功能描述:8位微控制器 -MCU AVR batman 16KB FLSH 4 MHZ,LGA,GRN1.8-9V 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 |
| ATMEGA16HVA-4TU | 功能描述:8位微控制器 -MCU 16KB Flash Memory 1.8V - 9.0V Supply 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 |
| ATMEGA16HVA-4TUR | 功能描述:8位微控制器 -MCU AVR batman 16KB FLSH 4 MHZ TSOP, 1.8-9V 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 |
| ATMEGA16HVB | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:8-bit Microcontroller with 16K/32K Bytes In-System Programmable Flash |
| ATMEGA16HVB_09 | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:8-bit Microcontroller with 16K/32K Bytes In-System Programmable Flash |
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