ATMEGA88PA-CCU Atmel, ATMEGA88PA-CCU Datasheet - Page 159
ATMEGA88PA-CCU
Manufacturer Part Number
ATMEGA88PA-CCU
Description
IC MCU AVR 8K FLASH 32VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA88PA-CCU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VFQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
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17.11 Register Description
17.11.1
8271C–AVR–08/10
TCCR2A – Timer/Counter Control Register A
• Bits 7:6 – COM2A1:0: Compare Match Output A Mode
These bits control the Output Compare pin (OC2A) behavior. If one or both of the COM2A1:0
bits are set, the OC2A output overrides the normal port functionality of the I/O pin it is connected
to. However, note that the Data Direction Register (DDR) bit corresponding to the OC2A pin
must be set in order to enable the output driver.
When OC2A is connected to the pin, the function of the COM2A1:0 bits depends on the
WGM22:0 bit setting.
are set to a normal or CTC mode (non-PWM).
Table 17-2.
Table 17-3
mode.
Table 17-3.
Note:
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
Bit
(0xB0)
Read/Write
Initial Value
COM2A1
COM2A1
0
0
1
1
0
0
1
1
1. A special case occurs when OCR2A equals TOP and COM2A1 is set. In this case, the Com-
pare Match is ignored, but the set or clear is done at BOTTOM. See
page 151
shows the COM2A1:0 bit functionality when the WGM21:0 bits are set to fast PWM
Compare Output Mode, non-PWM Mode
Compare Output Mode, Fast PWM Mode
COM2A1
R/W
COM2A0
COM2A0
7
0
for more details.
0
1
0
1
0
1
0
1
Table 17-2
COM2A0
R/W
0
6
Description
Normal port operation, OC0A disconnected.
Toggle OC2A on Compare Match
Clear OC2A on Compare Match
Set OC2A on Compare Match
Description
Normal port operation, OC2A disconnected.
WGM22 = 0: Normal Port Operation, OC0A Disconnected.
WGM22 = 1: Toggle OC2A on Compare Match.
Clear OC2A on Compare Match, set OC2A at BOTTOM,
(non-inverting mode).
Set OC2A on Compare Match, clear OC2A at BOTTOM,
(inverting mode).
shows the COM2A1:0 bit functionality when the WGM22:0 bits
COM2B1
R/W
5
0
COM2B0
R/W
4
0
R
3
0
–
(1)
R
2
–
0
WGM21
R/W
1
0
”Fast PWM Mode” on
WGM20
R/W
0
0
TCCR2A
159
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