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| 型號(hào)： | ATMEGA8 |
| 廠商： | Atmel Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
| 中文描述： | 位AVR微控制器具有8K字節(jié)的系統(tǒng)內(nèi)可編程閃存 |
| 文件頁(yè)數(shù)： | 31/125頁(yè) |
| 文件大小： | 6456K |
| 代理商： | ATMEGA8 |
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199
8021G–AVR–03/11
ATmega329P/3290P
The 4-bit counter can be both read and written via the data bus, and can generate an overflow
interrupt. Both the Serial Register and the counter are clocked simultaneously by the same clock
source. This allows the counter to count the number of bits received or transmitted and generate
an interrupt when the transfer is complete. Note that when an external clock source is selected
the counter counts both clock edges. In this case the counter counts the number of edges, and
not the number of bits. The clock can be selected from three different sources: The USCK pin,
Timer/Counter0 Compare Match or from software.
The Two-wire clock control unit can generate an interrupt when a start condition is detected on
the Two-wire bus. It can also generate wait states by holding the clock pin low after a start con-
dition is detected, or after the counter overflows.
20.3
Functional Descriptions
20.3.1
Three-wire Mode
The USI Three-wire mode is compliant to the Serial Peripheral Interface (SPI) mode 0 and 1, but
does not have the slave select (SS) pin functionality. However, this feature can be implemented
in software if necessary. Pin names used by this mode are: DI, DO, and USCK.
Figure 20-2. Three-wire Mode Operation, Simplified Diagram
Figure 20-2 shows two USI units operating in Three-wire mode, one as Master and one as
Slave. The two Shift Registers are interconnected in such way that after eight USCK clocks, the
data in each register are interchanged. The same clock also increments the USI’s 4-bit counter.
The Counter Overflow (interrupt) Flag, or USIOIF, can therefore be used to determine when a
transfer is completed. The clock is generated by the Master device software by toggling the
USCK pin via the PORT Register or by writing a one to the USITC bit in USICR.
SLAVE
MASTER
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
DO
DI
USCK
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
DO
DI
USCK
PORTxn
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ATMEGA8-16AC | 功能描述:8位微控制器 -MCU AVR 8K FLASH 512B EE 1K SRAM ADC 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 |
| ATMEGA8-16AI | 功能描述:8位微控制器 -MCU AVR 8K FLASH 512B EE 1K SRAM ADC 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 |
| ATMEGA8-16AI SL383 | 制造商:Atmel Corporation 功能描述:MCU 8-Bit ATmega AVR RISC 8KB Flash 5V 32-Pin TQFP T/R |
| ATMEGA8-16AJ | 功能描述:IC MCU AVR 8K 5V 16MHZ 32-TQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:AVR® ATmega 標(biāo)準(zhǔn)包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設(shè)備:POR，WDT 輸入/輸出數(shù):32 程序存儲(chǔ)器容量:32KB（32K x 8） 程序存儲(chǔ)器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP（0.600"，15.24mm） 包裝:管件 |
| ATmega8-16AU | 功能描述:8位微控制器 -MCU 8kB Flash 0.5kB EEPROM 23 I/O Pins 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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