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ATMEGA8-16PU 其他数据使用手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
DIP-28
描述:
8 位 megaAVR 微控制器，4KB 到 16KB 闪存我们在 RS Components 提供 Atmel 的各种 megaAVR 8 位微控制器。每个微控制器均基于增强型 RISC 体系结构，并具有 QTouch 库支持。 所有 megaAVR 微控制器具有不同 Kb 的系统内可编程内存、EEPROM 和 SRAM 以及不同引脚和封装类型。 **megaAVR 8 位微控制器类型 ** ATmega8 ATmega16 ATmega48 ATmega88 ATmega162 ATmega164 ATmega165 ATmega168 ATmega8515 ATmega8535
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ATMEGA8-16PU数据手册
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1
AVR081: Replacing AT90S4433 by ATmega8
Features
• AT90S4433 Errata Corrected in ATmega8
• Differences in Pin-out
• Changes to Names
• Improvements to Timer/Counters and Prescalers
• Changes to ADC
• Changes to Power Management
• Improvements to SPI and UART
• Changes to EEPROM Write Timing
• Programming Interface
• Fuse Settings
• Oscillators and Selecting Start-up Delays
• Changes to Watchdog Timer
• Other Concerns
Introduction
This application note is a guide to assist current AT90S4433 users in converting exist-
ing designs to the ATmega8. ATmega8 contains more Flash, SRAM, and EEPROM
memory space than AT90S4433, and it has additional peripheral modules and fea-
tures. Still the pin-out of the two devices are identical, and with a few modifications to
the I/O Register access, the ATmega8 can replace AT90S4433 on existing circuit
boards. In addition to the functional changes, the electrical characteristics of the
ATmega8 are different including an increase in operating frequency because of a
change in process technology. Check the data sheet for detailed information.
AT90S4433 Errata Corrected in ATmega8
The following items from the Errata Sheets of the AT90S4433 do not apply to the
ATmega8. Refer to the AT90S4433 Errata Sheet for a more detailed description of the
Errata.
Fuses and Programming Mode
When programming the ATmega8 in Serial Programming mode, it is possible to pro-
gram the Flash and EEPROM after programming the Fuses. If leaving Serial
Programming mode, it is possible to re-enter Programming mode.
Incorrect Channel Changes in Free Running Mode
In ATmega8, the MUXn and REFS1:0 bits in the ADMUX Register are buffered
through a temporary register to which the CPU has random access. This ensures that
the channels and reference selection only takes place at a safe point during the con-
version. Refer to the ATmega8 data sheet for further information and advices on how
to change these registers in Free Running mode.
8-bit
Microcontroller
Application
Note
Rev. 2515D–AVR–07/03
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