ATmega16HVB Atmel Corporation, ATmega16HVB Datasheet - Page 26

• 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

9.1.5
9.1.6
9.2
9.2.1
26
Clock sources
ATmega16HVB/32HVB
Coulomb counter ADC clock - clk
Watchdog timer and battery protection clock
Calibrated Fast RC oscillator
The Coulomb Counter ADC is provided with a dedicated clock domain. This allows operating the
Coulomb Counter ADC in low power modes like Power-save for continuous current
measurements.
The Watchdog Timer and Battery Protection are provided with a dedicated clock domain. This
allows operation in all modes except Power-off. It also allows very low power operation by utiliz-
ing an Ultra Low Power RC Oscillator dedicated to this purpose.
The following section describes the clock sources available in the device. The clocks are input to
the AVR clock generator, and routed to the appropriate modules.
The Atmel ATmega16HVB/32HVB has three on-board oscillators used to clock the internal logic.
Table 9-1
Table 9-1.
The calibrated Fast RC Oscillator by default provides a 8.0MHz clock. The frequency is nominal
value at 25°C. This clock will operate with no external components. During reset, hardware
loads the calibration byte into the FOSCCAL Register and thereby automatically calibrates the
Fast RC Oscillator. At 25°C, this calibration gives a frequency of 8MHz ±1%. The oscillator can
be calibrated to any frequency in the range 7.3MHz - 8.1MHz by changing the FOSCCAL regis-
ter. For more information on the pre-programmed calibration value, see the section
signature row from software” on page
by the
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 9-2.
Calibrated fast RC oscillator
Ultra low power RC oscillator
Slow RC oscillator
SUT2:0
9-2.
”System clock prescaler” on page
000
001
010
011
100
shows the clock sources and their usage.
Clock source
Available clock sources.
Start-up times for the calibrated Fast RC Oscillator clock selection.
CCADC
Start-up time from
power-save
6 CK
6 CK
6 CK
6 CK
6 CK
The clock source for the CPU, I/O, Flash, and Voltage ADC
The clock source for the Watchdog Timer, Battery Protection,
Bandgap Buffer Short Circuit Detector, and SMBus
Connect/Disconnect
Used by the Coulomb Counter ADC and Oscillator Sampling
Interface (OSI)
195. Note that the frequency of the system clock is given
28.
Additional delay from reset, typical values
Usage
14 CK + 16ms
14 CK + 32ms
14 CK + 64ms
14 CK + 4ms
14 CK + 8ms
8042D–AVR–10/11
”Reading the
(2)