ATmega8515 Atmel Corporation, ATmega8515 Datasheet - Page 38

• Manufacturer Part Number: ATmega8515
• Manufacturer: Atmel Corporation

Specifications of ATmega8515

• Flash (kbytes): 8 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 35
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 3
• Input Capture Channels: 1
• Pwm Channels: 3
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

External RC Oscillator
38
ATmega8515(L)
For timing insensitive applications, the external RC configuration shown in Figure 20
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.
Figure 20. 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 10.
Table 10. External RC Oscillator Operating Modes
When this Oscillator is selected, start-up times are determined by the SUT Fuses as
shown in Table 11.
Table 11. Start-up Times for the External RC Oscillator Clock Selection
Note:
SUT1..0
00
01
10
11
1. This option should not be used when operating close to the maximum frequency of
the device.
from Power-down
CKSEL3..0
Start-up Time
0101
0110
0111
1000
6 CK
18 CK
18 CK
18 CK
(1)
R
C
V
CC
Additional Delay from
Reset (V
NC
4.1 ms
4.1 ms
65 ms
CC
–
= 5.0V)
Frequency Range (MHz)
XTAL2
XTAL1
GND
8.0 - 12.0
0.1 - 0.9
0.9 - 3.0
3.0 - 8.0
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
Fast rising power or BOD
enabled
2512K–AVR–01/10