ATmega16HVA Atmel Corporation, ATmega16HVA Datasheet - Page 32
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ATmega16HVA
Manufacturer Part Number
ATmega16HVA
Description
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATmega16HVA-4TU
Manufacturer:
Atmel
Quantity:
20
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9.13.4
32
ATmega8HVA/16HVA
OSICSR – Oscillator Sampling Interface Control and Status Register
• Bit 7 – CLKPCE: Clock Prescaler Change Enable
The CLKPCE bit must be written to logic one to enable change of the CLKPS bits. The CLKPCE
bit is only updated when the other bits in CLKPR are simultaneously written to zero. CLKPCE is
cleared by hardware four cycles after it is written or when CLKPS bits are written. Rewriting the
CLKPCE bit within this time-out period does neither extend the time-out period, or clear the CLK-
PCE bit.
• Bit 1:0 – CLKPS1:0: Clock Prescaler Select Bit 1..0
These bits define the division factor between the selected clock source and the internal system
clock. These bits can be written run-time to vary the clock frequency to suit the application
requirements. As the divider divides the master clock input to the MCU, the speed of all synchro-
nous peripherals is reduced when a division factor is used. The division factors are given in
Table 9-3 on page
ongoing VADC conversion.
Table 9-3.
Note:
Table 9-4.
Note:
• Bits 7:5,3:2 – RES: Reserved bits
These bits are reserved bits in the ATmega8HVA/16HVA and will always read as zero.
Bit
0x17 (0x37)
Read/Write
Initial Value
1. Reserved values should not be written to CLKPS1..0.
1. When changing Prescaler value, the VADC Prescaler will automatically change frequency of
the VADC clock and abort any ongoing conversion.
CLKPS1
CLKPS1
System Clock Prescaler Select
VADC Clock Prescaling
0
0
1
1
0
0
1
1
R
7
–
0
32. Note that writing to the System Clock Prescaler Select bits will abort any
R
6
–
0
R
5
–
0
(1)
OSISEL0
R/W
CLKPS0
CLKPS0
4
0
0
1
0
1
0
1
0
1
R
3
–
0
R
2
–
0
VADC Division Factor
Clock Division Factor
OSIST
R
1
0
Reserved
Reserved
OSIEN
4
2
1
2
4
8
R/W
0
0
8024A–AVR–04/08
(1)
OSICSR
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