ATmega16HVA Atmel Corporation, ATmega16HVA Datasheet - Page 26

• Manufacturer Part Number: ATmega16HVA
• Manufacturer: Atmel Corporation

Specifications of ATmega16HVA

• Flash (kbytes): 16 Kbytes
• Pin Count: 28
• Max. Operating Frequency: 4 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 3
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 6
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 6
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 256
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -20 to 85
• I/o Supply Class: 1.8 to 9.0
• Operating Voltage (vcc): 1.8 to 9.0
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

9.4
9.5
9.6
26
Slow RC Oscillator
Ultra Low Power RC Oscillator
CPU, I/O, Flash, and Voltage ADC Clock
ATmega8HVA/16HVA
The Slow RC Oscillator provides a 131 kHz clock (typical value, refer to section "Electrical Char-
acteristics" on page 164 for details). This clock can be used as a timing reference for run-time
calibration of the Fast RC Oscillator and for accurately determining the actual ULP Oscillator fre-
quency, refer to
oscillator also provides the clock for the Coulomb Counter ADC.
The actual Slow RC Oscillator frequency depends on process variations and temperature, see
”Electrical Characteristics” on page
reference, the Slow RC Oscillator has prediction bytes stored in the signature address space,
refer to section
clock period of the Slow RC Oscillator in μs as a function of temperature is given by:
where T is the die temperature in Kelvin and T
nature row. The parameter "Slow RC period" holds information about the actual Slow RC
oscillator period measured at Atmel production. This parameter can be read from the signature
address space. Using the formula above, the actual Slow RC frequency can be found with an
error of <1% over the temperature area from -10 °C to +70 °C.The die temperature can be found
using the Voltage ADC, refer to section
Sigma-Delta ADC” on page 112
please refer to application note AVR351.
The Ultra Low Power RC Oscillator (ULP Oscillator) provides a 128 kHz clock (typical value).
This oscillator provides the clock for the Watchdog Timer and Battery Protection modules. The
actual ULP Oscillator frequency depends on process variations and temperature, see
Characteristics” on page
is also enabled during reset. There are two alternative methods for determining the actual clock
period of the ULP Oscillator:
1. To determine the accurate clock period as a function of die temperature, if needed by the
2. To determine a fixed value for the actual clock period independent of the die temperature,
The clock source for the CPU, I/O, Flash, and Voltage ADC is the calibrated Fast RC Oscillator.
application, the Oscillator Sampling Interface should be used. Refer to section
Oscillator Sampling Interface” on page 28
quency calculations, please refer to application note AVR351.
for example to determine the best setting of the Battery Protection timing, use the byte
ULP_RC_FRQ stored in the signature address space, refer to section
nature Row from Software” on page 144
Slow RC period
”Reading the Signature Row from Software” on page 144
”OSI – Oscillator Sampling Interface” on page 28
165. The Oscillator is automatically enabled in all operational modes. It
=
Slow RC period - Slow RC temp prediction word
--------------------------------------------------------------------------------------------------------------------------------------------------------------- -
for details. For examples on Slow RC frequency Prediction,
165.To provide a very good accuracy when used as a timing
”Voltage ADC – 5-channel General Purpose 12-bit
for details.
HOT
for details. For examples on ULP RC fre-
is the calibration temperature stored in the sig-
1024
for details. The Slow RC
⋅
for details. The actual
(T T
-------------------------- -
”Reading the Sig-
–
64
HOT
8024A–AVR–04/08
)
”OSI –
”Electrical