ATMEGA32M1-AU Atmel, ATMEGA32M1-AU Datasheet - Page 33
ATMEGA32M1-AU
Manufacturer Part Number
ATMEGA32M1-AU
Description
MPU AVR 32K FLASH 20MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA32M1-AU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
CAN, LIN, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 11x10b; D/A 1x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of I /o
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA32M1-AU
Manufacturer:
TYCO
Quantity:
210
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8.8
8.9
8209D–AVR–11/10
External Clock
Clock Output Buffer
To drive the device from an external clock source, XTAL1 should be driven as shown in
8-4. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”.
Figure 8-4.
Table 8-8.
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 8-9.
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
34
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).
CKSEL3..0
0000
SUT1..0
for details.
00
01
10
11
8-9.
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 - 16MHz
NC
Additional Delay from
ATmega16M1/32M1/64M1
Reset (V
Reserved
14CK + 4.1ms
14CK + 65ms
14CK
CC
= 5.0V)
“System Clock Prescaler” on page
XTAL2
XTAL1
GND
BOD enabled
Fast rising power
Slowly rising power
Recommended Usage
Figure
33
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