ATA6616-P3QW Atmel, ATA6616-P3QW Datasheet - Page 121

• 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

4.11.9
9132D–AUTO–12/10
Asynchronous Operation of Timer/Counter0
Figure 4-39
Figure 4-39. Timer/Counter Timing Diagram, Setting of OCF0A, with Prescaler (f
Figure 4-40
Figure 4-40. Timer/Counter Timing Diagram, Clear Timer on Compare Match mode, with
When Timer/Counter0 operates asynchronously, some considerations must be taken.
• Warning: When switching between asynchronous and synchronous clocking of
• If an 32.768 kHzwatch crystal is used, the CPU main clock frequency must be more than
Timer/Counter0, the timer registers TCNT0, OCR0A, and TCCR0A might be corrupted. A
safe procedure for switching clock source is:
a) Disable the Timer/Counter0 interrupts by clearing OCIE0A and TOIE0.
b) Select clock source by setting AS0 and EXCLK as appropriate.
c) Write new values to TCNT0, OCR0A, and TCCR0A.
d) To switch to asynchronous operation: Wait for TCN0UB, OCR0UB, and TCR0UB.
e) Clear the Timer/Counter0 interrupt flags.
f) Enable interrupts, if needed.
four times the Oscillator or external clock frequency.
TCNTn
(clk
OCRnx
(CTC)
OCFnx
clk
clk
I/O
I/O
Tn
/8)
shows the setting of OCF0A in all modes except CTC mode.
shows the setting of OCF0A and the clearing of TCNT0 in CTC mode.
TCNTn
OCRnx
OCFnx
(clk
clk
clk
Prescaler (f
I/O
I/O
Tn
/8)
TOP - 1
OCRnx - 1
clk_I/O
/8)
OCRnx
TOP
OCRnx Value
Atmel ATA6616/ATA6617
TOP
OCRnx + 1
BOTTOM
OCRnx + 2
BOTTOM + 1
clk_I/O
/8)
121