參數(shù)資料
型號： R5F2L388CNFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP80
封裝： 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80
文件頁數(shù)： 21/74頁
文件大?。?/td> 959K
代理商： R5F2L388CNFP
29
2588F–AVR–06/2013
ATtiny261/461/861
It is possible to reach a higher accuracy than factory calibration by changing the OSCCAL regis-
this calibration is shown as User calibration in Table 19-2 on page 189.
When this oscillator is used as device clock, the Watchdog Oscillator will still be used for the
Watchdog Timer and for the Reset Time-out. For more information on the pre-programmed cali-
bration value, see section “Calibration Byte” on page 173.
6.2.4
Internal 128 kHz Oscillator
The 128 kHz internal oscillator is a low power oscillator providing a clock of 128 kHz. The fre-
quency depends on supply voltage, temperature and batch variations. This clock may be select
as the system clock by programming the CKSEL Fuses to “0011”.
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Note:
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to 14CK + 4 ms to
ensure programming mode can be entered.
6.2.5
Low-Frequency Crystal Oscillator
To use a 32.768 kHz watch crystal as the clock source for the device, the low-frequency crystal
oscillator must be selected by setting CKSEL fuses to ‘0100’. The crystal should be connected
as shown in Figure 6-4. To find suitable capacitors please consult the manufacturer’s datasheet.
When this oscillator is selected, start-up times are determined by the SUT fuses as shown in
Notes:
1. These options should be used only if frequency stability at start-up is not important.
The Low-frequency Crystal Oscillator provides an internal load capacitance, see Table 6-10 at
each TOSC pin.
Table 6-8.
Start-up Times for the 128 kHz Internal Oscillator
SUT1:0
Start-up Time from Power-
down and Power-save
Additional Delay from
Reset
Recommended Usage
00
6 CK
14CK(1)
BOD enabled
01
6 CK
14CK + 4 ms
Fast rising power
10
6 CK
14CK + 64 ms
Slowly rising power
11
Reserved
Table 6-9.
Start-up Times for the Low Frequency Crystal Oscillator Clock Selection
SUT1:0
Start-up Time
from Power Down
Additional Delay
from Reset
Recommended usage
00
1K (1024) CK(1)
4 ms
Fast rising power or BOD enabled
01
1K (1024) CK(1)
64 ms
Slowly rising power
10
32K (32768) CK
64 ms
Stable frequency at start-up
11
Reserved
Table 6-10.
Capacitance for Low-Frequency Crystal Oscillator
Device
32 kHz Osc. Type
Cap (Xtal1/Tosc1)
Cap (Xtal2/Tosc2)
ATtiny261/461/861
System Osc.
16 pF
6 pF
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
R5F2L388MDFA#V0 制造商:Renesas Electronics Corporation 功能描述:R8C/L38M 64+4/8 80LQFP 14X14 - 制造商:Renesas Electronics Corporation 功能描述:R8C/L38M 64+4/8 80LQFP 14X14 -40 TO +85 - Trays 制造商:Renesas Electronics Corporation 功能描述:MCU 16BIT 64KB FLASH 80LQFP
R5F2L388MDFP#V0 制造商:Renesas Electronics Corporation 功能描述:IC MCU 16BIT 64KB FLASH 80LQFP
R5F2L388MNFA#V0 制造商:Renesas Electronics Corporation 功能描述:R8C/L38M 64+4/8 80LQFP 14X14 -20 TO +85 - Trays 制造商:Renesas Electronics Corporation 功能描述:IC MCU 16BIT 64KB FLASH 80LQFP
R5F2L388MNFP#V0 制造商:Renesas Electronics Corporation 功能描述:IC MCU 16BIT 64KB FLASH 80LQFP
R5F2L38ACDFA#U1 制造商:Renesas Electronics Corporation 功能描述:
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