ATMEGA8535L-8AC Atmel, ATMEGA8535L-8AC Datasheet - Page 28

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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Low-frequency Crystal
Oscillator
External RC Oscillator
28
ATmega8535(L)
To use a 32.768 kHz watch crystal as the clock source for the device, the Low-fre-
quency Crystal Oscillator must be selected by setting the CKSEL Fuses to “1001”. The
crystal should be connected as shown in Figure 12. By programming the CKOPT Fuse,
the user can enable internal capacitors on XTAL1 and XTAL2, thereby removing the
need for external capacitors. The internal capacitors have a nominal value of 36 pF.
When this Oscillator is selected, start-up times are determined by the SUT fuses as
shown in Table 6.
Table 6. Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
Note:
For timing insensitive applications, the external RC configuration shown in Figure 13
can be used. The frequency is roughly estimated by the equation f = 1/(3RC). C should
be at least 22 pF. By programming the CKOPT Fuse, the user can enable an internal
36 pF capacitor between XTAL1 and GND, thereby removing the need for an external
capacitor. For more information on Oscillator operation and details on how to choose R
and C, refer to the External RC Oscillator application note.
Figure 13. External RC Configuration
The Oscillator can operate in four different modes, each optimized for a specific fre-
quency range. The operating mode is selected by the fuses CKSEL3..0 as shown in
Table 7.
SUT1..0
00
01
10
11
1. These options should only be used if frequency stability at start-up is not important
for the application.
Start-up Time from
Power-down and
Power-save
1K CK
1K CK
32K CK
(1)
(1)
C
R
V
CC
Additional Delay
NC
(V
from Reset
CC
4.1 ms
65 ms
65 ms
= 5.0V)
Reserved
XTAL2
XTAL1
GND
Recommended Usage
Fast rising power or BOD enabled
Slowly rising power
Stable frequency at start-up
2502K–AVR–10/06

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