ATmega16HVB Atmel Corporation, ATmega16HVB Datasheet - Page 20

• Manufacturer Part Number: ATmega16HVB
• Manufacturer: Atmel Corporation

Specifications of ATmega16HVB

• Flash (kbytes): 16 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 8 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 17
• Ext Interrupts: 15
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 4.0 to 25
• Operating Voltage (vcc): 4.0 to 25
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

8.5.1
8.6
8.6.1
8.6.2
20
Register description
ATmega16HVB/32HVB
General purpose I/O registers
EEARH and EEARL– The EEPROM Address Register High and Low
EEDR – The EEPROM data register
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. The Atmel
ATmega16HVB/32HVB is a complex microcontroller with more peripheral units than can be sup-
ported within the 64 location reserved in Opcode for the IN and OUT instructions. For the
Extended I/O space from 0x60 - 0xFF in SRAM, only the ST/STS/STD and LD/LDS/LDD instruc-
tions can be used.
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 only operate on the specified bit, and can therefore be used on registers contain-
ing such status flags. The CBI and SBI instructions work with registers 0x00 to 0x1F only.
The I/O and peripherals control registers are explained in later sections.
The ATmega16HVB/32HVB 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.
• Bits 15:10 – Reserved
These bits are reserved bits in the ATmega16HVB/32HVB and will always read as zero.
• Bits 9:0 – EEAR9:0: EEPROM address
The EEPROM Address Registers – EEAR specify the EEPROM address in the 512/1Kbytes
EEPROM space. The EEPROM data bytes are addressed linearly between 0 and 511/1023.
The initial value of EEAR is undefined. A proper value must be written before the EEPROM may
be accessed.
Bit
0x22 (0x42)
0x21 (0x41)
Bit
Read/Write
Initial Value
Bit
0x20 (0x40)
Read/Write
Initial Value
EEAR7
MSB
R/W
R/W
15
R
X
7
0
7
0
EEAR6
R/W
R/W
14
R
X
6
0
6
0
EEAR5
R/W
R/W
13
R
X
5
0
5
0
EEAR4
R/W
R/W
12
R
X
4
0
4
0
EEAR3
R/W
R/W
11
R
3
0
X
3
0
EEAR2
R/W
R/W
10
R
X
2
0
2
0
EEAR9
EEAR1
R/W
R/W
R/W
9
1
X
X
1
0
EEAR8
EEAR0
R/W
R/W
LSB
R/W
X
X
8
0
0
0
8042D–AVR–10/11
EEARH
EEARL
EEDR