ATmega8HVA Atmel Corporation, ATmega8HVA Datasheet - Page 108

• Manufacturer Part Number: ATmega8HVA
• Manufacturer: Atmel Corporation

Specifications of ATmega8HVA

• Flash (kbytes): 8 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

108
ATmega8HVA/16HVA
• Bit 5 - CADUB: CC-ADC Update Busy
The CC-ADC operates in a different clock domain than the CPU. Whenever a new value is writ-
ten to CADCSRA or CADRC this value must be synchronized to the CCADC clock domain.
Subsequent writes to these registers will be blocked during this synchronization. Synchroniza-
tion of one of the registers will block updating of all the others. The CADUB bit will be read as
one while any of these registers is being synchronized, and will be read as zero when neither
register is being synchronized.
• Bits 4:3: CADAS[1:0]: CC-ADC Accumulate Current Select
The CADAS bits select the conversion time for the Accumulate Current output as shown in
19-1.
Table 19-1.
Note:
”Slow RC Oscillator” on page 26
• Bits 2:1: CADSI[1:0]: CC-ADC Current Sampling Interval
The CADSI bits determine the current sampling interval for the Regular Current detection as
shown in
Table 19-2.
Notes:
• Bit 0 - CADSE: CC-ADC Sampling Enable
When the CADSE bit is written to one, the ongoing CC-ADC conversion is aborted, and the
CCADC enters Regular Current detection mode.
1. The actual value depends on the actual frequency of the Slow RC oscillator, see
1. The actual value depends on the actual frequency of the Slow RC oscillator, see
2. Sampling time ~ 12 ms.
Table
CADAS[1:0]
CADSI[1:0]
Oscillator” on page 26
CC-ADC Accumulate Current Conversion Time
CC-ADC Regular Current Sampling Interval
00
01
10
11
00
01
10
11
19-2.
.
.
CC-ADC Accumulate Current
CC-ADC Regular Current
250 ms (+ sampling time)
500 ms (+ sampling time)
Sampling Interval
1s (+ sampling time)
2s (+ sampling time)
Conversion Time
125 ms
250 ms
500 ms
1s
(1)(2)
(1)
Number of CC-ADC Clock
Number of CC-ADC Clock
16384 (+ sampling time)
32768 (+ sampling time)
65536 (+ sampling time)
8192 (+ sampling time)
Cycles
Cycles
16384
32768
4096
8192
8024A–AVR–04/08
”Slow RC
Table