3. If 8 MHz frequency exceeds the specification of the device (depends on V
鍙冩暩(sh霉)璩囨枡
鍨嬭櫉锛� ATMEGA32U2-AUR
寤犲晢锛� Atmel
鏂囦欢闋佹暩(sh霉)锛� 235/310闋�
鏂囦欢澶�?銆�?/td> 0K
鎻忚堪锛� MCU AVR 32K FLASH 16MHZ 32TQFP
鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″锛� MCU Product Line Introduction
megaAVR Introduction
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 2,000
绯诲垪锛� AVR® ATmega
鏍稿績铏曠悊鍣細 AVR
鑺珨灏哄锛� 8-浣�
閫熷害锛� 16MHz
閫i€氭€э細 SPI锛孶ART/USART锛孶SB
澶栧湇瑷�(sh猫)鍌欙細 娆犲妾㈡脯/寰�(f霉)浣嶏紝POR锛孭WM锛學DT
杓稿叆/杓稿嚭鏁�(sh霉)锛� 22
绋嬪簭瀛樺劜鍣ㄥ閲忥細 32KB锛�16K x 16锛�
绋嬪簭瀛樺劜鍣ㄩ鍨嬶細 闁冨瓨
EEPROM 澶у皬锛� 1K x 8
RAM 瀹归噺锛� 1K x 8
闆诲 - 闆绘簮 (Vcc/Vdd)锛� 2.7 V ~ 5.5 V
鎸暕鍣ㄥ瀷锛� 鍏�(n猫i)閮�
宸ヤ綔婧害锛� -40°C ~ 85°C
灏佽/澶栨锛� 32-TQFP
鍖呰锛� 甯跺嵎 (TR)
閰嶇敤锛� ATSTK600-RC20-ND - STK600 ROUTING CARD AVR
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31
7799D鈥揂VR鈥�11/10
ATmega8U2/16U2/32U2
3. If 8 MHz frequency exceeds the specification of the device (depends on VCC), the CKDIV8
Fuse can be programmed in order to divide the internal frequency by 8. It must be ensured
that the resulting divided clock meets the frequency specification of the device.
The CKSEL0 Fuse together with the SUT1..0 Fuses select the start-up times as shown in Table
Notes: 1. These options should only be used when not operating close to the maximum frequency of the
device, and only if frequency stability at start-up is not important for the application. These
options are not suitable for crystals.
2. These options are intended for use with ceramic resonators and will ensure frequency stability
at start-up. They can also be used with crystals when not operating close to the maximum fre-
quency of the device, and if frequency stability at start-up is not important for the application.
Note:
1.
The device is shipped with this option selected.
Table 8-4.
Start-up Times for the Low Power Crystal Oscillator Clock Selection
Oscillator Source /
Power Conditions
Start-up Time from
Power-down and
Power-save
Additional Delay
from Reset
(V
CC = 5.0V)
CKSEL0
SUT1..0
Ceramic resonator, fast
rising power
258 CK
14CK + 4.1 ms(1)
000
Ceramic resonator, slowly
rising power
258 CK
14CK + 65 ms(1)
001
Ceramic resonator, BOD
enabled
1K CK
010
Ceramic resonator, fast
rising power
1K CK
14CK + 4.1 ms(2)
011
Ceramic resonator, slowly
rising power
1K CK
14CK + 65 ms(2)
100
Crystal Oscillator, BOD
enabled
16K CK
14CK
1
01
Crystal Oscillator, fast
rising power
16K CK
14CK + 4.1 ms
1
10
Crystal Oscillator, slowly
rising power
16K CK
14CK + 65 ms
1
11
Table 8-5.
Start-up times for the internal calibrated RC Oscillator clock selection
Power Conditions
Start-up Time from Power-
down and Power-save
Additional Delay from
Reset (V
CC = 5.0V)
SUT1..0
BOD enabled
6 CK
14CK
00
Fast rising power
6 CK
14CK + 4.1 ms
01
Slowly rising power
6 CK
14CK + 65 ms(1)
10
Reserved
11
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