AT90CAN64-16AUR Atmel, AT90CAN64-16AUR Datasheet - Page 43

• Manufacturer Part Number: AT90CAN64-16AUR
• Description: MCU AVR 64K FLASH 16MHZ 64TQFP
• Manufacturer: Atmel
• Series: AVR® 90CANr

Specifications of AT90CAN64-16AUR

• 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: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K 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-TQFP, 64-VQFP
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.8
5.9
7679H–CAN–08/08
Clock Output Buffer
Timer/Counter2 Oscillator
Figure 5-4.
Table 5-10.
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 5-11.
When applying an external clock, it is required to avoid sudden changes in the applied clock fre-
quency to ensure stable operation of the MCU. A variation in frequency of more than 2% from
one clock cycle to the next can lead to unpredictable behavior. It is required to ensure that the
MCU is kept in Reset during such changes in the clock frequency.
Note that the System Clock Prescaler can be used to implement run-time changes of the internal
clock frequency while still ensuring stable operation. Refer to
44
When the CKOUT Fuse is programmed, the system Clock will be output on CLKO. This mode is
suitable when chip clock is used to drive other circuits on the system. The clock will be output
also during reset and the normal operation of I/O pin will be overridden when the fuse is pro-
grammed. Any clock source, including internal RC Oscillator, can be selected when CLKO
serves as clock output. If the System Clock Prescaler is used, it is the divided system clock that
is output (CKOUT Fuse programmed).
For AVR microcontrollers with Timer/Counter2 Oscillator pins (TOSC1 and TOSC2), the crystal
is connected directly between the pins. The Oscillator is optimized for use with a 32.768 kHz
watch crystal. 12-22 pF capacitors may be necessary if the parasitic impedance (pads, wires &
PCB) is very low.
CKSEL3..0
0000
SUT1..0
for details.
00
01
10
11
5-11.
Start-up Time from Power-
External Clock Drive Configuration
External Clock Frequency
Start-up Times for the External Clock Selection
down and Power-save
6 CK
6 CK
6 CK
External
Signal
Clock
Frequency Range
0 - 16 MHz
NC
Additional Delay from
Reset (V
Reserved
14 CK + 4.1 ms
14 CK + 65 ms
14 CK
CC
= 5.0V)
AT90CAN32/64/128
“System Clock Prescaler” on page
XTAL2
XTAL1
GND
BOD enabled
Fast rising power
Slowly rising power
Recommended Usage
43