atmega103 ATMEL Corporation, atmega103 Datasheet - Page 27
atmega103
Manufacturer Part Number
atmega103
Description
Atmega103 8-bit With 128k Bytes Of In-system Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATMEGA103.pdf
(141 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
atmega103-6AC
Manufacturer:
ATMEL
Quantity:
1
Company:
Part Number:
atmega103-6AI
Manufacturer:
ATMEL
Quantity:
586
- Current page: 27 of 141
- Download datasheet (3Mb)
Power-on Reset
0945I–AVR–02/07
Table 5. Reset Characteristics (V
Note:
A Power-on Reset (POR) circuit ensures that the device is Reset from Power-on. As
shown in Figure 23, an internal timer clocked from the Watchdog Timer Oscillator pre-
vents the MCU from starting until after a certain period after V
on Threshold voltage (V
bits SUT1 and SUT0 are used to select start-up time as indicated in Table 5. A “0” in the
table indicates that the fuse is programmed.
The user can select the start-up time according to typical Oscillator start-up time. The
number of WDT Oscillator cycles used for each Time-out except for SUT = 00 is shown
in Table 6. The frequency of the Watchdog Oscillator is voltage-dependent as shown in
“Typical Characteristics” on page 123.
Table 6. Number of Watchdog Oscillator Cycles
The setting SUT 1/0 = 00 starts the MCU after 5 CPU clock cycles, and can be used
when an external clock signal is applied to the XTAL1 pin. This setting does not use the
WDT Oscillator and enables very fast start-up from the sleep modes Power-down or
Power-save if the clock signal is present during sleep. For details, refer to the program-
ming specification starting on page 104.
If the built-in start-up delay is sufficient, RESET can be connected to V
an external pull-up resistor. By holding the pin low for a period after V
applied, the Power-on Reset period can be extended. Refer to Figure 25 for a timing
example of this.
Symbol
V
V
T
SUT 1/0
01
10
11
TOUT
POT
RST
(1)
1. The Power-on Reset will not work unless the supply voltage has been below V
(falling).
Parameter
Power-on Reset Threshold
(rising)
Power-on Reset Threshold
(falling)
RESET Pin Threshold Voltage
Reset Delay Time-out Period
Time-out at V
0.5 ms
4.0 ms
16.0 ms
POT
), regardless of the V
CC
= 5V
CC
= 5.0V)
Condition
SUT = 00
SUT = 01
SUT = 10
SUT = 11
CC
Number of WDT Cycles
512
4K
16K
rise time (see Figure 24). The Fuse
12.8
Min
1.0
0.4
0.4
3.2
ATmega103(L)
CC
V
16.0
Typ
1.4
0.6
0.5
4.0
CC
5
has reached the Power-
/2
Max
19.2
1.8
0.8
0.6
4.8
CC
directly or via
CC
CPU cycles
has been
Units
ms
V
V
V
POT
27
Related parts for atmega103
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
High-performance EE PLD
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
8-bit Flash Microcontroller
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
2-Wire Serial EEPROM
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
U6046BREAR WINDOW HEATING TIMER / LONG-TERM TIMER
Manufacturer:
ATMEL Corporation
Datasheet: