ATMEGA128A-ANR Atmel, ATMEGA128A-ANR Datasheet - Page 52

• Manufacturer Part Number: ATMEGA128A-ANR
• Description: IC MCU AVR 128K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA128A-ANR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP
• Core: AVR8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
52