ATMEGA128L-8AI Atmel, ATMEGA128L-8AI Datasheet - Page 109
![IC AVR MCU 128K 8MHZ LV 64-TQFP](/photos/12/13/121332/313-64-tqfp_sml.jpg)
ATMEGA128L-8AI
Manufacturer Part Number
ATMEGA128L-8AI
Description
IC AVR MCU 128K 8MHZ LV 64-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA128L-8AI
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
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, 64-VQFP
For Use With
ATSTK501 - ADAPTER KIT FOR 64PIN AVR MCU
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA128L8AI
Available stocks
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Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA128L-8AI
Manufacturer:
AT
Quantity:
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Part Number:
ATMEGA128L-8AI
Manufacturer:
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Timer/Counter
Prescaler
Special Function IO
Register – SFIOR
2467V–AVR–02/11
Figure 45. Prescaler for Timer/Counter0
The clock source for Timer/Counter0 is named clk
system clock clk
from the TOSC1 pin. This enables use of Timer/Counter0 as a Real Time Counter (RTC). When
AS0 is set, pins TOSC1 and TOSC2 are disconnected from Port C. A crystal can then be con-
nected between the TOSC1 and TOSC2 pins to serve as an independent clock source for
Timer/Counter0. The Oscillator is optimized for use with a 32.768kHz crystal. Applying an exter-
nal clock source to TOSC1 is not recommended.
For Timer/Counter0, the possible prescaled selections are: clk
clk
Setting the PSR0 bit in SFIOR resets the prescaler. This allows the user to operate with a pre-
dictable prescaler.
• Bit 7 – TSM: Timer/Counter Synchronization Mode
Writing the TSM bit to one activates the Timer/Counter Synchronization mode. In this mode, the
value that is written to the PSR0 and PSR321 bits is kept, hence keeping the corresponding
prescaler reset signals asserted. This ensures that the corresponding Timer/Counters are halted
and can be configured to the same value without the risk of one of them advancing during con-
figuration. When the TSM bit is written to zero, the PSR0 and PSR321 bits are cleared by
hardware, and the Timer/Counters start counting simultaneously.
Bit
Read/Write
Initial Value
T0S
TOSC1
/128, clk
clk
PSR0
CS00
CS01
CS02
AS0
I/O
TSM
R/W
T0S
7
0
I/O
/256, and clk
. By setting the AS0 bit in ASSR, Timer/Counter0 is asynchronously clocked
R
6
–
0
clk
T0S
T0S
R
5
–
0
/1024. Additionally, clk
Clear
R
4
–
0
TIMER/COUNTER0 CLOCK SOURCE
ACME
R/W
0
3
0
T0
. clk
10-BIT T/C PRESCALER
T0S
T0
PUD
clk
R/W
2
0
as well as 0 (stop) may be selected.
T0
is by default connected to the main
PSR0
R/W
1
0
T0S
/8, clk
PSR321
ATmega128
R/W
0
0
T0S
/32, clk
SFIOR
T0S
/64,
109
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