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参数资料
| 型号： | ISD4003-04MP |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 音频合成 |
| 英文描述： | 240 SEC, SPEECH SYNTHESIZER WITH RCDG, PDIP28 |
| 封装： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件页数： | 27/37页 |
| 文件大小： | 392K |
| 代理商： | ISD4003-04MP |
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33
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
Figure 9-3.
External clock drive configuration.
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in Table 9-13.
When applying an external clock, it is required to avoid sudden changes in the applied clock frequency to ensure
stable operation of the MCU. A variation in frequency of more than 2% from one clock cycle to the next can lead to
unpredictable behavior. It is required to ensure that the MCU is kept in Reset during such changes in the clock
frequency.
Note that the System Clock Prescaler can be used to implement run-time changes of the internal clock frequency
while still ensuring stable operation. Refer to ”System clock prescaler” on page 34 for details.
Table 9-12.
XTAL oscillator clock frequency.
CKSEL3...0
Frequency range
ATmega 165A/165PA/645A/645P
0000
0 - 16MHz
ATmega325A/325PA/3250A/3250PA/6450A/6450P
0000
0 - 20MHz
Table 9-13.
Start-up times for the external clock selection.
SUT1..0
Start-up time from power-
down and power-save
Additional delay from
reset (VCC = 5.0V)
Recommended usage
00
6CK
14CK
BOD enabled
01
6CK
14CK + 4.1ms
Fast rising power
10
6CK
14CK + 65ms
Slowly rising power
11
Reserved
NC
EXTERNAL
CLOCK
SIGNAL
XTAL2
XTAL1
GND
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| ISD4003-04MSI | 240 SEC, SPEECH SYNTHESIZER WITH RCDG, PDSO28 |
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