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參數(shù)資料
| 型號： | MC80C52EXXX-12SC |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CDIP40 |
| 文件頁數(shù)： | 66/125頁 |
| 文件大?。?/td> | 6456K |
| 代理商： | MC80C52EXXX-12SC |
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24
2486AA–AVR–02/2013
ATmega8(L)
tion circuit can be used. If a reset occurs while a write operation is in progress, the write
operation will be completed provided that the power supply voltage is sufficient.
I/O Memory
The I/O space definition of the ATmega8 is shown in “Register Summary” on page 309.
All AtmelAVR ATmega8 I/Os and peripherals are placed in the I/O space. The I/O locations
are accessed by the IN and OUT instructions, transferring data between the 32 general purpose
working registers and the I/O space. I/O Registers within the address range 0x00 - 0x1F are
directly bit-accessible using the SBI and CBI instructions. In these registers, the value of single
bits can be checked by using the SBIS and SBIC instructions. Refer to the “Instruction Set Sum-
mary” on page 311 for more details. When using the I/O specific commands IN and OUT, the I/O
addresses 0x00 - 0x3F must be used. When addressing I/O Registers as data space using LD
and ST instructions, 0x20 must be added to these addresses.
For compatibility with future devices, reserved bits should be written to zero if accessed.
Reserved I/O memory addresses should never be written.
Some of the Status Flags are cleared by writing a logical one to them. Note that the CBI and SBI
instructions will operate on all bits in the I/O Register, writing a one back into any flag read as
set, thus clearing the flag. The CBI and SBI instructions work with registers 0x00 to 0x1F only.
The I/O and Peripherals Control Registers are explained in later sections.
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