ATmega644P Automotive Atmel Corporation, ATmega644P Automotive Datasheet - Page 52
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ATmega644P Automotive
Manufacturer Part Number
ATmega644P Automotive
Description
Manufacturer
Atmel Corporation
Specifications of ATmega644P Automotive
Flash (kbytes)
64 Kbytes
Pin Count
44
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
3
Twi (i2c)
1
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
4
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 125
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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9.0.5
9.0.6
52
ATmega164P/324P/644P
Brown-out Detection
Watchdog Reset
Figure 9-2.
ATmega164P/324P/644P has an On-chip Brown-out Detection (BOD) circuit for monitoring the
V
can be selected by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure spike
free Brown-out Detection. The hysteresis on the detection level should be interpreted as V
V
When the BOD is enabled, and V
9-3 on page
trigger level (V
Time-out period t
The BOD circuit will only detect a drop in V
ger than t
Figure 9-3.
When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period t
page 60
CC
BOT
level during operation by comparing it to a fixed trigger level. The trigger level for the BOD
+ V
HYST
for details on operation of the Watchdog Timer.
BOD
CC
52), the Brown-out Reset is immediately activated. When V
/2 and V
given in
External Reset During Operation
Brown-out Reset During Operation
INTERNAL
TIME-OUT
BOT+
TOUT
RESET
RESET
V
in
CC
BOT-
has expired.
“System and Reset Characteristics” on page
Figure 9-3 on page
= V
BOT
- V
CC
HYST
decreases to a value below the trigger level (V
V
BOT-
/2.
CC
52), the delay counter starts the MCU after the
if the voltage stays below the trigger level for lon-
V
t
TOUT
BOT+
332.
CC
increases above the
TOUT
7674F–AVR–09/09
BOT-
. Refer to
in
Figure
BOT+
=
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