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型號(hào)：	MQ80C52TXXX-20/883D
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQFP44
文件頁(yè)數(shù)：	212/604頁(yè)
文件大?。?/td>	22337K
代理商：	MQ80C52TXXX-20/883D

42073A-MCU Wireless-02/13

ATmega2564/1284/644RFR2

must be used. When addressing I/O Registers as data space using LD and ST

instructions,

ATmega2564/1284/644RFR2 is a complex microcontroller with more peripheral units

than can be supported within the 64 location reserved in Opcode for the IN and OUT

instructions. For the Extended I/O space from 0x60 – 0x1FF in SRAM, only the

ST/STS/STD and LD/LDS/LDD instructions can be used.

For compatibility with future devices, reserved bits may not be modified. Reserved

registers and I/O memory addresses should never be written.

Some of the Status Flags are cleared by writing a logical one to them. Note that, unlike

most other AVRs, the CBI and SBI instructions will only operate on the specified bit,

and can therefore be used on registers containing such Status Flags. The CBI and SBI

instructions work with registers 0x00 to 0x1F only.

The control registers of I/O and peripherals are explained in later sections.

8.6 General Purpose I/O Registers

The ATmega2564/1284/644RFR2 contains three General Purpose I/O Registers.

These registers can be used for storing any information, and they are particularly useful

for storing global variables and Status Flags. General Purpose I/O Registers within the

address range 0x00 – 0x1F are directly bit-accessible using the SBI, CBI, SBIS, and

SBIC instructions.

8.6.1 GPIOR0 – General Purpose IO Register 0

GPIOR07:00

Initial Value

The three General Purpose I/O Registers can be used for storing any information.

Bit 7:0 – GPIOR07:00 - General Purpose I/O Register 0 Value

8.6.2 GPIOR1 – General Purpose IO Register 1

GPIOR17:10

Initial Value

The three General Purpose I/O Registers can be used for storing any information.

Bit 7:0 – GPIOR17:10 - General Purpose I/O Register 1 Value

8.6.3 GPIOR2 – General Purpose I/O Register 2

GPIOR27:20

Initial Value

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