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參數(shù)資料
| 型號： | R5F6418JADFE |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP176 |
| 封裝： | 24 X 24 MM, 0.50 MM PITCH, PLASTIC, LQFP-176 |
| 文件頁數(shù)： | 54/128頁 |
| 文件大?。?/td> | 922K |
| 代理商： | R5F6418JADFE |
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31
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
When this clock source is selected, start-up times are determined by the SUT fuses as shown in Table 9-14.
9.8
External Clock
To drive the device from an external clock source, XTAL1 should be driven as shown in Figure 9-4. To run the device on an
external clock, the CKSEL fuses must be programmed to “0000” (see Table 9-15).
Figure 9-4. External Clock Drive Configuration
When this clock source is selected, start-up times are determined by the SUT fuses as shown in Table 9-16.
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. If changes of more than 2% is required, ensure that the MCU is kept in reset during the changes.
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 Section 9.11 “System Clock Prescaler” on page 32 for details.
Table 9-14. Start-up Times for the 128kHz Internal Oscillator
Power Conditions
Start-up Time from Power-down and
Power-save
Additional Delay from Reset
SUT1...0
BOD enabled
6CK
14CK(1)
00
Fast rising power
6CK
14CK + 4ms
01
Slowly rising power
6CK
14CK + 64ms
10
Reserved
11
Note:
1.
If the RSTDISBL fuse is programmed, this start-up time will be increased to
14CK + 4.1ms to ensure programming mode can be entered.
Table 9-15. Crystal Oscillator Clock Frequency
Frequency
CKSEL3...0
0 - 16MHz
0000
Table 9-16. Start-up Times for the External Clock Selection
Power Conditions
Start-up Time from Power-down and
Power-save
Additional Delay from Reset
(VCC = 5.0V)
SUT1...0
BOD enabled
6CK
14CK
00
Fast rising power
6CK
14CK + 4.1ms
01
Slowly rising power
6CK
14CK + 65ms
10
Reserved
11
XTAL2
XTAL1
GND
PB7
EXTERNAL
CLOCK
SIGNAL
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R5F6418JANFD | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RENESAS MCU |
| R5F6418JANFE | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RENESAS MCU |
| R5F6418JANFE_12 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RENESAS MCU |
| R5F6418JAPFD | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RENESAS MCU |
| R5F6418JAPFE | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RENESAS MCU |
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