ATMEGA16HVA-4CKU Atmel, ATMEGA16HVA-4CKU Datasheet - Page 31

• Manufacturer Part Number: ATMEGA16HVA-4CKU
• Description: MCU AVR 16K FLASH 4MHZ 36-LGA
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16HVA-4CKU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 7
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 9 V
• Data Converters: A/D 5x12b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 36-LGA
• Processor Series: ATMEGA16x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: SPI
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRSB200, ATAVRSB201
• Minimum Operating Temperature: - 20 C
• On-chip Adc: 12 bit, 5 Channel
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.13.2
9.13.3
8024A–AVR–04/08
MCUCR – MCU Control Register
CLKPR – Clock Prescale Register
The FCAL[4:0] bits are used to tune the frequency within the selected range. A setting of 0x00
gives the lowest frequency in that range, and a setting of 0x1F gives the highest frequency in the
range. Incrementing FCAL[4:0] by 1 will give a frequency increment of less than 1.5 % in the fre-
quency range 7.3-8.1 MHz. With an accurate time reference, an oscillator accuracy of ±1% can
be achieved after calibration. The frequency will drift with temperature, so run-time calibration
will be required to maintain the accuracy. Refer to
28
The default FOSCCAL value found in the signature row, is selected such that it is in the the
lower half of a segment (see
oscillator). It is therefore sufficient to use the default segment and the one below to calibrate the
frequency over the whole temperature range. To avoid a large frequency change when shifting
between the two segments, a FOSC SEGMENT value is stored in the signature row. This is the
first FOSCCAL value giving a lower frequency than the lowest value in the default segment, and
should be used when calibrating the Fast RC oscillator.
• Bit 5 – CKOE: Clock Output
When this bit is written to one, the CPU clock divided by 2 is output on the PB0 pin.
Bit
0x35 (0x55)
Read/Write
Initial Value
Bit
(0x61)
Read/Write
Initial Value
for details.
CLKPCE
-–
R
7
0
R/W
7
0
R
6
–
0
R
6
–
0
Figure 30-1 on page 174
CKOE
R/W
5
0
R
5
–
0
PUD
R/W
4
0
R
4
–
0
”OSI – Oscillator Sampling Interface” on page
R
3
–
0
R
3
–
0
for typical characteristics of the FAST RC
ATmega8HVA/16HVA
R
2
–
0
R
2
–
0
R
1
–
0
CLKPS1
R/W
1
1
R
0
–
0
CLKPS0
R/W
MCUCR
0
1
CLKPR
31