ATMEGA8535L-8AC Atmel, ATMEGA8535L-8AC Datasheet - Page 130

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

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

Timer/Counter Register –
TCNT2
130
ATmega8535(L)
Table 54 shows the COM21:0 bit functionality when the WGM21:0 bits are set to phase
correct PWM mode.
Table 54. Compare Output Mode, Phase Correct PWM Mode
Note:
• Bit 2:0 – CS22:0: Clock Select
The three clock select bits select the clock source to be used by the Timer/Counter, see
Table 55.
Table 55. Clock Select Bit Description
The Timer/Counter Register gives direct access, both for read and write operations, to
the Timer/Counter unit 8-bit counter. Writing to the TCNT2 Register blocks (removes)
the Compare Match on the following timer clock. Modifying the counter (TCNT2) while
the counter is running, introduces a risk of missing a Compare Match between TCNT2
and the OCR2 Register.
Bit
Read/Write
Initial Value
COM21
CS22
0
0
1
1
0
0
0
0
1
1
1
1
1. A special case occurs when OCR2 equals TOP and COM21 is set. In this case, the
COM20
Compare Match is ignored, but the set or clear is done at TOP. See “Phase Correct
PWM Mode” on page 125 for more details.
CS21
0
1
0
1
R/W
0
0
1
1
0
0
1
1
7
0
Description
Normal port operation, OC2 disconnected.
Reserved
Clear OC2 on Compare Match when up-counting. Set OC2 on Compare
Match when down-counting.
Set OC2 on Compare Match when up-counting. Clear OC2 on Compare
Match when down-counting.
R/W
6
0
CS20
0
1
0
1
0
1
0
1
R/W
5
0
Description
No clock source (Timer/Counter stopped).
clk
clk
clk
clk
clk
clk
clk
T
T
T2S
T2S
T2S
T2S
T2S
2
2
S
S
/256 (From prescaler)
/1024 (From prescaler)
R/W
/(No prescaling)
/8 (From prescaler)
/32 (From prescaler)
/64 (From prescaler)
/128 (From prescaler)
4
0
TCNT2[7:0]
R/W
3
0
R/W
2
0
(1)
R/W
1
0
R/W
0
0
2502K–AVR–10/06
TCNT2