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ATMEGA48PA-AU 参数 Datasheet PDF下载

ATMEGA48PA-AU图片预览
型号: ATMEGA48PA-AU
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器与4/8/ 16 / 32K字节的系统内可编程闪存 [8-bit Microcontroller with 4/8/16/32K Bytes In-System Programmable Flash]
分类和应用: 闪存微控制器和处理器外围集成电路时钟
文件页数/大小: 448 页 / 12817 K
品牌: ATMEL [ ATMEL ]
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ATmega48PA/88PA/168PA/328P  
The next code examples show assembly and C functions for reading the EEPROM. The exam-  
ples assume that interrupts are controlled so that no interrupts will occur during execution of  
these functions.  
Assembly Code Example  
EEPROM_read:  
; Wait for completion of previous write  
sbic EECR,EEPE  
rjmp EEPROM_read  
; Set up address (r18:r17) in address register  
out EEARH, r18  
out EEARL, r17  
; Start eeprom read by writing EERE  
sbi EECR,EERE  
; Read data from Data Register  
in r16,EEDR  
ret  
C Code Example  
unsigned char EEPROM_read(unsigned int uiAddress)  
{
/* Wait for completion of previous write */  
while(EECR & (1<<EEPE))  
;
/* Set up address register */  
EEAR = uiAddress;  
/* Start eeprom read by writing EERE */  
EECR |= (1<<EERE);  
/* Return data from Data Register */  
return EEDR;  
}
7.6.4  
7.6.5  
7.6.6  
GPIOR2 – General Purpose I/O Register 2  
Bit  
0x2B (0x4B)  
7
6
5
4
3
2
1
0
MSB  
LSB  
R/W  
0
GPIOR2  
GPIOR1  
GPIOR0  
Read/Write  
Initial Value  
R/W  
0
R/W  
0
R/W  
0
R/W  
0
R/W  
0
R/W  
0
R/W  
0
GPIOR1 – General Purpose I/O Register 1  
Bit  
7
MSB  
R/W  
0
6
5
4
3
2
1
0
0x2A (0x4A)  
Read/Write  
Initial Value  
LSB  
R/W  
0
R/W  
0
R/W  
0
R/W  
0
R/W  
0
R/W  
0
R/W  
0
GPIOR0 – General Purpose I/O Register 0  
Bit  
7
MSB  
R/W  
0
6
5
4
3
2
1
0
0x1E (0x3E)  
Read/Write  
Initial Value  
LSB  
R/W  
0
R/W  
0
R/W  
0
R/W  
0
R/W  
0
R/W  
0
R/W  
0
25  
8161D–AVR–10/09