ATmega16HVB Atmel Corporation, ATmega16HVB Datasheet - Page 124
ATmega16HVB
Manufacturer Part Number
ATmega16HVB
Description
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
Available stocks
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Price
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Part Number:
ATmega16HVB-8X3
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Quantity:
51
Part Number:
ATmega16HVB-8X3
Manufacturer:
ATMEL/爱特梅尔
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20 000
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21.6
21.6.1
21.6.2
124
Register description
ATmega16HVB/32HVB
BGCCR – Bandgap Calibration C Register
BGCRR – Bandgap Calibration R Register
•
These bits are reserved and will always read as zero.
•
These bits are used for trimming of the nominal value of the bandgap reference voltage. These
bits are binary coded. Minimum VREF: 000000, maximum VREF: 111111. Step size is approxi-
mately 2mV. The application software should read the Atmel factory calibration value and store it
to the BGCCR register. See
•
These bits are used for temperature gradient adjustment of the bandgap reference.
on page 125
coefficient at low temperatures and negative temperature coefficient at high temperatures.
Depending on the process variations, the top of the VREF curve may be located at higher or
lower temperatures. To minimize the temperature drift in the temperature range of interest,
BGCRR is used to adjust the top of the curve towards the centre of the temperature range of
interest. The BGCRR bits are thermometer coded, resulting in 9 possible settings: 00000000,
00000001, 00000011, 00000111, … , 11111111. The value 00000000 shifts the top of the VREF
curve to the highest possible temperature, and the value 11111111 shifts the top of the VREF
curve to the lowest possible temperature. The application software should read the Atmel factory
calibration value and store it to the BGCRR register. See
ware” on page 195
Bit
(0xD0)
Read/Write
Initial Value
Bit
(0xD1)
Read/Write
Initial Value
Bits 7:6 – Reserved
Bit 5:0 – BGCC[5:0]: BG Calibration of PTAT Current
Bit 7:0 – BGCR[7:0]: BG Calibration of Resistor ladder
BGCR7
illustrates VREF as a function of temperature. VREF has a positive temperature
R/W
R
7
–
0
7
0
for details.
BGCR6
R/W
R
6
–
0
6
0
”Reading the signature row from software” on page 195
BGCC5
BGCR5
R/W
R/W
5
0
5
0
BGCC4
BGCR4
R/W
R/W
4
0
4
0
BGCC3
BGCR3
R/W
R/W
3
0
3
1
”Reading the signature row from soft-
BGCC2
BGCR2
R/W
R/W
2
0
2
1
BGCC1
BGCR1
R/W
R/W
1
0
1
1
BGCC0
BGCR0
R/W
R/W
0
0
0
1
8042D–AVR–10/11
Figure 21-2
for details.
BGCCR
BGCRR
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