ATmega128A Atmel Corporation, ATmega128A Datasheet - Page 52

• 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

10.2.1
8151H–AVR–02/11
Power-on Reset
Figure 10-1. Reset Logic
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in
V
well as to detect a failure in supply voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
device is kept in RESET after V
when V
Figure 10-2. MCU Start-up, RESET Tied to V
CC
is below the detection level. The POR circuit can be used to trigger the Start-up Reset, as
CC
INTERNAL
TIME-OUT
BODLEVEL
decreases below the detection level.
RESET
RESET
RESET
BODEN
PEN
V
“System and Reset Characteristics” on page
CC
Pull-up Resistor
Pull-up Resistor
Power-On Reset
JTAG Reset
Register
FILTER
SPIKE
D
L
Circuit
Q
Q
V
V
POT
RST
CC
CKSEL[3:0]
t
rise. The RESET signal is activated again, without any delay,
TOUT
SUT[1:0]
Watchdog
Watchdog
Oscillator
Generator
Timer
Clock
Reset Circuit
Reset Circuit
Brown-Out
CC
CK
MCU Control and Status
.
Register (MCUCSR)
DATA BUS
Delay Counters
324. The POR is activated whenever
ATmega128A
TIMEOUT
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