ATA6616-P3PW Atmel, ATA6616-P3PW Datasheet - Page 148
ATA6616-P3PW
Manufacturer Part Number
ATA6616-P3PW
Description
TXRX MULTICHIP MOD LIN SIP 38QFN
Manufacturer
Atmel
Series
AVR® ATA66 LIN-SBCr
Datasheet
1.ATA6617-EK.pdf
(308 pages)
Specifications of ATA6616-P3PW
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
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Atmel ATA6616/ATA6617
Figure 4-50. CTC Mode, Timing Diagram
An interrupt can be generated at each time the counter value reaches the TOP value by either
using the OCF1A or ICF1 flag according to the register used to define the TOP value. If the
interrupt is enabled, the interrupt handler routine can be used for updating the TOP value.
However, changing the TOP to a value close to BOTTOM when the counter is running with
none or a low prescaler value must be done with care since the CTC mode does not have the
double buffering feature. If the new value written to OCR1A or ICR1 is lower than the current
value of TCNT1, the counter will miss the compare match. The counter will then have to count
to its maximum value (0xFFFF) and wrap around starting at 0x0000 before the compare match
can occur. In many cases this feature is not desirable. An alternative will then be to use the
fast PWM mode using OCR1A for defining TOP (WGM13:0 = 15) since the OCR1A then will
be double buffered.
For generating a waveform output in CTC mode, the OC1A output can be set to toggle its log-
ical level on each compare match by setting the Compare Output mode bits to toggle mode
(COM1A1:0 = 1). The OC1A value will not be visible on the port pin unless the data direction
for the pin is set to output (DDR_OC1A = 1) and OC1Ai is set. The waveform generated will
have a maximum frequency of f
waveform frequency is defined by the following equation:
The N variable represents the prescaler factor (1, 8, 64, 256, or 1024).
As for the Normal mode of operation, the TOV1 flag is set in the same timer clock cycle that
the counter counts from MAX to 0x0000.
f
OCnA
TCNTn
OCnAi
(Toggle)
Period
=
-------------------------------------------------------- -
2
N
f
clk_I/O
1
+
OCRnA
1
OC
2
1
A
= f
clk_I/O
3
/2 when OCR1A is set to zero (0x0000). The
4
OCnA Interrupt Flag Set
or ICFn Interrupt Flag Set
(Interrupt on TOP)
(COMnA1:0 = 1)
9132D–AUTO–12/10
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