Datasheet

69
8069R–AVR–06/2013
XMEGA A4
Not recommended for new designs -
Use XMEGA A4U series
Note: 1. See Figure 34-2 on page 69 for definition
Figure 34-2. TOSC input capacitance
The input capacitance between the TOSC pins is CL1 + CL2 in series as seen from the crystal
when oscillating without external capacitors.
Notes: 1. Non-prescaled System Clock source.
2. Time from pin change on external interrupt pin to first available clock cycle. Additional interrupt response time is minimum 5
system clock source cycles.
Table 34-18. External 32.768kHz Crystal Oscillator and TOSC characteristics
Symbol Parameter Condition Min Typ Max Units
SF Safety factor
Capacitive load matched to crystal
specification
3
ESR/R
1
Recommended crystal equivalent
series resistance (ESR)
Crystal load capacitance 6.5pF 60
k

Crystal load capacitance 9.0pF 35
C
IN_TOSC
Input capacitance between TOSC
pins
Normal mode 4.7
pF
Low power mode 5.2
C
L1
C
L2
TOSC1 TOSC2
Device internal
External
32.768 KHz crystal
Table 34-19. Device wake-up time from sleep
Symbol Parameter Condition
(1)
Min Typ
(2)
Max Units
Idle Sleep, Standby and Extended
Standby sleep mode
Int. 32.768 kHz RC 130
µS
Int. 2 MHz RC 2
Ext. 2 MHz Clock 2
Int. 32 MHz RC 0.17
Power-save and Power-down
Sleep mode
Int. 32.768 kHz RC 320
Int. 2 MHz RC 10.3
Ext. 2 MHz Clock 4.5
Int. 32 MHz RC 5.8