ATMEGA8535L-8AC Atmel, ATMEGA8535L-8AC Datasheet - Page 30

IC AVR MCU 8K LV 8MHZ COM 44TQFP

ATMEGA8535L-8AC

Manufacturer Part Number
ATMEGA8535L-8AC
Description
IC AVR MCU 8K LV 8MHZ COM 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets

Specifications of ATMEGA8535L-8AC

Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Manufacturer
Quantity
Price
Part Number:
ATMEGA8535L-8AC
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Quantity:
6 269
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Manufacturer:
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Quantity:
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Oscillator Calibration Register
– OSCCAL
30
ATmega8535(L)
Table 10. Start-up Times for the Internal Calibrated RC Oscillator Clock Selection
Note:
• Bits 7..0 – CAL7..0: Oscillator Calibration Value
Writing the calibration byte to this address will trim the Internal Oscillator to remove pro-
cess variations from the Oscillator frequency. During Reset, the 1 MHz calibration value
which is located in the signature row high byte (address 0x00) is automatically loaded
into the OSCCAL Register. If the internal RC is used at other frequencies, the calibration
values must be loaded manually. This can be done by first reading the signature row by
a programmer, and then store the calibration values in the Flash or EEPROM. Then the
value can be read by software and loaded into the OSCCAL Register.
When OSCCAL is zero, the lowest available frequency is chosen. Writing non-zero val-
ues to this register will increase the frequency of the Internal Oscillator. Writing 0xFF to
the register gives the highest available frequency. The calibrated Oscillator is used to
time EEPROM and Flash access. If EEPROM or Flash is written, do not calibrate to
more than 10% above the nominal frequency. Otherwise, the EEPROM or Flash write
may fail. Note that the Oscillator is intended for calibration to 1.0, 2.0, 4.0, or 8.0 MHz.
Tuning to other values is not guaranteed, as indicated in Table 11.
Table 11. Internal RC Oscillator Frequency Range.
Bit
Read/Write
Initial Value
SUT1..0
OSCCAL Value
10
00
01
11
(1)
0xFF
0x00
0x7F
1. The device is shipped with this option selected.
Start-up Time from Power-
down and Power-save
CAL7
R/W
7
Min Frequency in Percentage of
6 CK
6 CK
6 CK
CAL6
R/W
Nominal Frequency (%)
6
CAL5
R/W
5
100
Device Specific Calibration Value
75
50
CAL4
R/W
Additional Delay from
4
Reset (V
Reserved
CAL3
R/W
4.1 ms
65 ms
3
CC
= 5.0V)
Max Frequency in Percentage of
CAL2
R/W
2
Nominal Frequency (%)
CAL1
R/W
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
1
100
150
200
CAL0
R/W
0
2502K–AVR–10/06
OSCCAL

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