ATA6616-P3QW Atmel, ATA6616-P3QW Datasheet - Page 131

• Manufacturer Part Number: ATA6616-P3QW
• Description: TXRX MULTICHIP MOD LIN SIP 38QFN
• Manufacturer: Atmel
• Series: AVR® ATA66 LIN-SBCr

Specifications of ATA6616-P3QW

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, LIN, SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 38-VQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9132D–AUTO–12/10
The synchronization and edge detector logic introduces a delay of 2.5 to 3.5 system clock
cycles from an edge has been applied to the T1 pin to the counter is updated.
Enabling and disabling of the clock input must be done when T1 has been stable for at least
one system clock cycle, otherwise it is a risk that a false Timer/Counter clock pulse is
generated.
Each half period of the external clock applied must be longer than one system clock cycle to
ensure correct sampling. The external clock must be guaranteed to have less than half the
system clock frequency (f
tor uses sampling, the maximum frequency of an external clock it can detect is half the
sampling frequency (Nyquist sampling theorem). However, due to variation of the system
clock frequency and duty cycle caused by Oscillator source (crystal, resonator, and capaci-
tors) tolerances, it is recommended that maximum frequency of an external clock source is
less than f
An external clock source can not be prescaled.
Figure 4-43. Prescaler for Timer/Counter1
Note:
CLK
PSRn
1. The synchronization logic on the input pin (T1) is shown in
Tn
I/O
clk_I/O
/2.5.
Synchronization
ExtClk
< f
CSn0
CSn1
CSn2
clk_I/O
/2) given a 50/50 % duty cycle. Since the edge detec-
Clear
(1)
Atmel ATA6616/ATA6617
TIMER/COUNTERn CLOCK SOURCE
0
10-BIT T/C PRESCALER
clk
Tn
Figure
4-42.
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