ATxmega128D4-AU ATMEL [ATMEL Corporation], ATxmega128D4-AU Datasheet - Page 77

• Manufacturer Part Number: ATxmega128D4-AU
• Description: 8/16-bit Atmel XMEGA D4 Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

Table 32-25. External clock with prescaler
Notes:
8135L–AVR–06/12
Symbol
1/t
Δt
t
t
t
t
t
CH
CR
CK
CL
CF
CK
CK
1. System Clock Prescalers must be set so that maximum CPU clock frequency for device is not exceeded.
2. The maximum frequency vs. supply voltage is linear between 1.8V and 2.7V, and the same applies for all other parameters
with supply voltage conditions.
Parameter
Clock frequency
Clock period
Clock High Time
Clock Low Time
Rise time (for maximum frequency)
Fall time (for maximum frequency)
Change in period from one clock cycle to the next
.
(2)
(1)
for system clock.
Condition
V
V
V
V
V
V
V
V
CC
CC
CC
CC
CC
CC
CC
CC
= 1.6 - 1.8V
= 2.7 - 3.6V
= 1.6 - 1.8V
= 2.7 - 3.6V
= 1.6 - 1.8V
= 2.7 - 3.6V
= 1.6 - 1.8V
= 2.7 - 3.6V
Min.
4.5
2.4
4.5
2.4
11
0
0
7
Typ.
XMEGA D4
Max.
142
1.5
1.5
90
10
Units
MHz
ns
%
77