ATA6612C View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
ATA6612C
Atmel Corporation
'ATA6612C' PDF : 312 Pages View PDF
When this clock source is selected, start-up times are determined by the SUT fuses as shown in Table 5-14.
Table 5-14. Start-up Times for the 128kHz Internal Oscillator
Power Conditions
Start-up Time from Power-down and
Power-save
Additional Delay from Reset
BOD enabled
6CK
14CK(1)
Fast rising power
6CK
14CK + 4ms
Slowly rising power
6CK
14CK + 64ms
Note:
Reserved
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.
SUT1..0
00
01
10
11
5.6.8
External Clock
The device can utilize a external clock source as shown in Figure 5-14. To run the device on an external clock, the CKSEL
fuses must be programmed as shown in Table 5-15.
Table 5-15. Full Swing Crystal Oscillator Operating Modes(2)
Notes:
Frequency Range(1) (MHz)
CKSEL3..0
Recommended Range for Capacitors
C1 and C2 (pF)
0 - 100
0000
1. The frequency ranges are preliminary values. Actual values are TBD.
12 - 22
2. If 8MHz 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.
Figure 5-14. External Clock Drive Configuration
NC
EXTERNAL
CLOCK
SIGNAL
XTAL2
XTAL1
GND
When this clock source is selected, start-up times are determined by the SUT fuses as shown in Table 5-16.
Table 5-16. Start-up Times for the External Clock Selection
Power Conditions
BOD enabled
Fast rising power
Slowly rising power
Start-up Time from Power-down and
Power-save
6CK
6CK
6CK
Reserved
Additional Delay from Reset
(VCC = 5.0V)
14CK
14CK + 4.1ms
14CK + 65ms
SUT1..0
00
01
10
11
ATA6612C/ATA6613C [DATASHEET]
53
9111L–AUTO–11/14
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