ATMEGA8515-16AC Atmel, ATMEGA8515-16AC Datasheet - Page 108
ATMEGA8515-16AC
Manufacturer Part Number
ATMEGA8515-16AC
Description
IC AVR MCU 8K 16MHZ COM 44-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8515-16AC
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
35
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)
4.5 V ~ 5.5 V
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
Data Converters
-
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Manufacturer
Quantity
Price
Company:
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MOT
Quantity:
3 450
Part Number:
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Compare Match Output
Unit
108
ATmega8515(L)
The Compare Output mode (COM1x1:0) bits have two functions. The Waveform Gener-
ator uses the COM1x1:0 bits for defining the Output Compare (OC1x) state at the next
Compare Match. Secondly the COM1x1:0 bits control the OC1x pin output source. Fig-
ure 51 shows a simplified schematic of the logic affected by the COM1x1:0 bit setting.
The I/O Registers, I/O bits, and I/O pins in the figure are shown in bold. Only the parts of
the general I/O Port Control Registers (DDR and PORT) that are affected by the
COM1x1:0 bits are shown. When referring to the OC1x state, the reference is for the
internal OC1x Register, not the OC1x pin. If a System Reset occur, the OC1x Register is
reset to “0”.
Figure 51. Compare Match Output Unit, Schematic
The general I/O port function is overridden by the Output Compare (OC1x) from the
Waveform Generator if either of the COM1x1:0 bits are set. However, the OC1x pin
direction (input or output) is still controlled by the Data Direction Register (DDR) for the
port pin. The Data Direction Register bit for the OC1x pin (DDR_OC1x) must be set as
output before the OC1x value is visible on the pin. The port override function is generally
independent of the waveform generation mode, but there are some exceptions. Refer to
Table 50, Table 51, and Table 52 for details.
The design of the output compare pin logic allows initialization of the OC1x state before
the output is enabled. Note that some COM1x1:0 bit settings are reserved for certain
modes of operation. See “16-bit Timer/Counter Register Description” on page 119.
The COM1x1:0 bits have no effect on the Input Capture unit.
COMnx1
COMnx0
FOCnx
clk
I/O
Waveform
Generator
D
D
D
PORT
DDR
OCnx
Q
Q
Q
1
0
2512K–AVR–01/10
OCnx
Pin
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