AT90CAN128-16MI Atmel, AT90CAN128-16MI Datasheet - Page 161
![IC MCU AVR FLASH 128K 64-QFN](/photos/12/13/121326/313-64-qfn_sml.jpg)
AT90CAN128-16MI
Manufacturer Part Number
AT90CAN128-16MI
Description
IC MCU AVR FLASH 128K 64-QFN
Manufacturer
Atmel
Series
AVR® 90CANr
Specifications of AT90CAN128-16MI
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
CAN, EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
For Use With
ATDVK90CAN1 - KIT DEV FOR AT90CAN128 MCU
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
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Part Number:
AT90CAN128-16MI
Manufacturer:
ATMEL
Quantity:
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14.10.2
7679H–CAN–08/08
Asynchronous Operation of Timer/Counter2
When Timer/Counter2 operates asynchronously, some considerations must be taken.
• Warning: When switching between asynchronous and synchronous clocking of
• The Oscillator is optimized for use with a 32.768 kHz watch crystal. The CPU main clock
• When writing to one of the registers TCNT2, OCR2A, or TCCR2A, the value is transferred to
• When entering Power-save or Extended Standby mode after having written to TCNT2,
• If Timer/Counter2 is used to wake the device up from Power-save or Extended Standby
• When the asynchronous operation is selected, the 32.768 kHz Oscillator for Timer/Counter2
Timer/Counter2, the timer registers TCNT2, OCR2A, and TCCR2A might be corrupted. A
safe procedure for switching clock source is:
frequency must be more than four times the Oscillator or external clock frequency.
a temporary register, and latched after two positive edges on TOSC1. The user should not
write a new value before the contents of the temporary register have been transferred to its
destination. Each of the three mentioned registers have their individual temporary register,
which means that e.g. writing to TCNT2 does not disturb an OCR2A write in progress. To
detect that a transfer to the destination register has taken place, the Asynchronous Status
Register – ASSR has been implemented.
OCR2A, or TCCR2A, the user must wait until the written register has been updated if
Timer/Counter2 is used to wake up the device. Otherwise, the MCU will enter sleep mode
before the changes are effective. This is particularly important if the Output Compare2
interrupt is used to wake up the device, since the Output Compare function is disabled during
writing to OCR2A or TCNT2. If the write cycle is not finished, and the MCU enters sleep
mode before the OCR2UB bit returns to zero, the device will never receive a compare match
interrupt, and the MCU will not wake up.
mode, precautions must be taken if the user wants to re-enter one of these modes: The
interrupt logic needs one TOSC1 cycle to be reset. If the time between wake-up and re-
entering sleep mode is less than one TOSC1 cycle, the interrupt will not occur, and the
device will fail to wake up. If the user is in doubt whether the time before re-entering Power-
save mode is sufficient, the following algorithm can be used to ensure that one TOSC1 cycle
has elapsed:
is always running, except in Power-down and Standby modes. After a Power-up Reset or
wake-up from Power-down or Standby mode, the user should be aware of the fact that this
Oscillator might take as long as one second to stabilize. The user is advised to wait for at
least one second before using Timer/Counter2 after power-up or wake-up from Power-down
or Standby mode. The contents of all Timer/Counter2 Registers must be considered lost after
a wake-up from Power-down or Standby mode due to unstable clock signal upon start-up, no
matter whether the Oscillator is in use or a clock signal is applied to the TOSC1 pin.
a. Disable the Timer/Counter2 interrupts by clearing OCIE2A and TOIE2.
b. Select clock source by setting AS2 and EXCLK as appropriate.
c. Write new values to TCNT2, OCR2A, and TCCR2A.
d. To switch to asynchronous operation: Wait for TCN2UB, OCR2UB, and TCR2UB.
e. Clear the Timer/Counter2 interrupt flags.
f.
a. Write a value to TCCR2A, TCNT2, or OCR2A.
b. Wait until the corresponding Update Busy flag in ASSR returns to zero.
c. Enter Power-save or ADC Noise Reduction mode.
Enable interrupts, if needed.
AT90CAN32/64/128
161
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