ATmega645P Atmel Corporation, ATmega645P Datasheet - Page 248
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ATmega645P
Manufacturer Part Number
ATmega645P
Description
Manufacturer
Atmel Corporation
Specifications of ATmega645P
Flash (kbytes)
64 Kbytes
Pin Count
64
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
54
Ext Interrupts
17
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
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 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
4
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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25.5.5
Table 25-3.
8285D–AVR–06/11
Signal Name
COMP
ACLK
ACTEN
ADCBGEN
ADCEN
AMPEN
Scanning the ADC
Boundary-scan Signals for the ADC
Direction as seen
from the ADC
Output
Input
Input
Input
Input
Input
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
Figure 25-9 on page 248
observe signals. The Boundary-scan cell from
these signals. The ADC need not be used for pure connectivity testing, since all analog inputs
are shared with a digital port pin as well.
Figure 25-9. Analog to Digital Converter
The signals are described briefly in
NEGSEL_2
NEGSEL_1
NEGSEL_0
MUXEN_7
MUXEN_6
MUXEN_5
MUXEN_4
MUXEN_3
MUXEN_2
MUXEN_1
MUXEN_0
EXTCH
ADC_7
ADC_6
ADC_5
ADC_4
ADC_3
ADC_2
ADC_1
ADC_0
Description
Comparator Output
Clock signal to differential amplifier
implemented as Switch-cap filters
Enable path from differential
amplifier to the comparator
Enable Band-gap reference as
negative input to comparator
Power-on signal to the ADC
Power-on signal to the differential
amplifier
ADC_2
ADC_0
ADC_1
SCTEST
AMPEN
ACLK
(1)
ST
To Comparator
shows a block diagram of the ADC with all relevant control and
+
-
1x
Table 25-3 on page
ADCBGEN
VCCREN
IREFEN
AREF
PASSEN
Recommended
Input when not
in Use
ACTEN
1.22V
GNDEN
ref
Figure 25-5 on page 245
1.11V
ref
0
0
0
0
0
0
248.
PRECH
DAC_9..0
ADCEN
HOLD
Output Values when
recommended inputs are Used,
and CPU is not Using the ADC
PRECH
AREF
10-bit DAC
is attached to each of
AREF
0
0
0
0
0
0
+
-
DACOUT
COMP
COMP
248
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