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参数资料
| 型号： | MB9AF314NBGL |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PBGA112 |
| 封装： | 0.80 MM PITCH, PLASTIC, FBGA-112 |
| 文件页数： | 40/114页 |
| 文件大小： | 1357K |
| 代理商： | MB9AF314NBGL |
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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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