ATmega128A Atmel Corporation, ATmega128A Datasheet - Page 267

• Manufacturer Part Number: ATmega128A
• Manufacturer: Atmel Corporation

Specifications of ATmega128A

• Flash (kbytes): 128 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: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• 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): 4096
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

8151H–AVR–02/11
Table 24-5.
Signal
Name
HOLD
IREFEN
MUXEN_7
MUXEN_6
MUXEN_5
MUXEN_4
MUXEN_3
MUXEN_2
MUXEN_1
MUXEN_0
NEGSEL_2
NEGSEL_1
NEGSEL_0
PASSEN
PRECH
SCTEST
ST
VCCREN
Boundary-scan Signals for the ADC (Continued)
Direction
as Seen
from the
ADC
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Description
Sample & Hold signal.
Sample analog signal
when low. Hold signal
when high. If gain stages
are used, this signal
must go active when
ACLK is high.
Enables Band-gap
reference as AREF
signal to DAC
Input Mux bit 7
Input Mux bit 6
Input Mux bit 5
Input Mux bit 4
Input Mux bit 3
Input Mux bit 2
Input Mux bit 1
Input Mux bit 0
Input Mux for negative
input for differential
signal, bit 2
Input Mux for negative
input for differential
signal, bit 1
Input Mux for negative
input for differential
signal, bit 0
Enable pass-gate of gain
stages.
Precharge output latch of
comparator. (Active low)
Switch-cap TEST
enable. Output from x10
gain stage send out to
Port Pin having ADC_4
Output of gain stages will
settle faster if this signal
is high first two ACLK
periods after AMPEN
goes high.
Selects Vcc as the ACC
reference voltage.
Recommen-
ded Input
when not
in Use
1
0
0
0
0
0
0
0
0
1
0
0
0
1
1
0
0
0
ATmega128A
Output Values when
Recommended Inputs
are Used, and CPU is
not Using the ADC
1
0
0
0
0
0
0
0
0
1
0
0
0
1
1
0
0
0
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