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8018P–AVR–08/10
ATmega169P
7.5
General Purpose I/O Registers
The ATmega169P 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 Sta-
tus Flags. General Purpose I/O Registers within the address range 0x00 - 0x1F are directly bit-
accessible using the SBI, CBI, SBIS, and SBIC instructions.
7.5.1
GPIOR2 – General Purpose I/O Register 2
7.5.2
GPIOR1 – General Purpose I/O Register 1
7.5.3
GPIOR0 – General Purpose I/O Register 0
7.6
EEPROM Register Description
7.6.1
EEARH and EEARL – EEPROM Address Register
Bits 15:9 – Res: Reserved Bits
These bits are reserved and will always read as zero.
Bits 8:0 – EEAR8:0: EEPROM Address
The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the
512 bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and
511. The initial value of EEAR is undefined. A proper value must be written before the EEPROM
may be accessed.
Bit
765
4321
0
0x2B (0x4B)
MSB
LSB
GPIOR2
Read/Write
R/W
Initial Value
000
0000
0
Bit
765
4321
0
0x2A (0x4A)
MSB
LSB
GPIOR1
Read/Write
R/W
Initial Value
000
0000
0
Bit
765
4321
0
0x1E (0x3E)
MSB
LSB
GPIOR0
Read/Write
R/W
Initial Value
000
0000
0
Bit
151413
121110
9
8
0x22 (0x42)
–––
–
EEAR8
EEARH
0x21 (0x41)
EEAR7
EEAR6
EEAR5
EEAR4
EEAR3
EEAR2
EEAR1
EEAR0
EEARL
765
432
10
Read/Write
RR
RRR
RR
R/W
Initial Value
0
X
XXX
X
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相关PDF资料
2-1546217-0 TERM BLK RCPT 20POS SIDE 5.08MM
1-1546217-9 TERM BLK RCPT 19POS SIDE 5.08MM
1-1546217-8 TERM BLK RCPT 18POS SIDE 5.08MM
1-1546217-7 TERM BLK RCPT 17POS SIDE 5.08MM
1-1546217-6 TERM BLK RCPT 16POS SIDE 5.08MM
1-1546217-5 TERM BLK RCPT 15POS SIDE 5.08MM
1-1546217-4 TERM BLK RCPT 14POS SIDE 5.08MM
1-1546217-3 TERM BLK RCPT 13POS SIDE 5.08MM
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