ATMEGA88-20MJ Atmel, ATMEGA88-20MJ Datasheet - Page 154

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ATMEGA88-20MJ

Manufacturer Part Number
ATMEGA88-20MJ
Description
IC MCU AVR 8K 5V 20MHZ 32-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets

Specifications of ATMEGA88-20MJ

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)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ATMEGA88-24MJ
ATMEGA88-24MJ
154
ATmega48/88/168
Table 17-6
mode.
Table 17-6.
Note:
Table 17-7
rect PWM mode.
Table 17-7.
Note:
• Bits 3, 2 – Res: Reserved Bits
These bits are reserved bits in the ATmega48/88/168 and will always read as zero.
• Bits 1:0 – WGM21:0: Waveform Generation Mode
Combined with the WGM22 bit found in the TCCR2B Register, these bits control the counting
sequence of the counter, the source for maximum (TOP) counter value, and what type of wave-
form generation to be used, see
unit are: Normal mode (counter), Clear Timer on Compare Match (CTC) mode, and two types of
Pulse Width Modulation (PWM) modes (see
COM2B1
COM2B1
0
0
1
1
0
0
1
1
1. A special case occurs when OCR2B equals TOP and COM2B1 is set. In this case, the Com-
1. A special case occurs when OCR2B equals TOP and COM2B1 is set. In this case, the Com-
pare Match is ignored, but the set or clear is done at TOP. See
page 147
pare Match is ignored, but the set or clear is done at TOP. See
page 147
shows the COM2B1:0 bit functionality when the WGM22:0 bits are set to phase cor-
shows the COM2B1:0 bit functionality when the WGM22:0 bits are set to fast PWM
Compare Output Mode, Fast PWM Mode
Compare Output Mode, Phase Correct PWM Mode
COM2B0
COM2B0
for more details.
for more details.
0
1
0
1
0
1
0
1
Description
Normal port operation, OC2B disconnected.
Reserved
Clear OC2B on Compare Match, set OC2B at BOTTOM,
(non-inverting mode)
Set OC2B on Compare Match, clear OC2B at BOTTOM,
(invertiing mode)
Description
Normal port operation, OC2B disconnected.
Reserved
Clear OC2B on Compare Match when up-counting. Set OC2B on
Compare Match when down-counting.
Set OC2B on Compare Match when up-counting. Clear OC2B on
Compare Match when down-counting.
Table
17-8. Modes of operation supported by the Timer/Counter
“Modes of Operation” on page
(1)
(1)
“Phase Correct PWM Mode” on
“Phase Correct PWM Mode” on
144).
2545S–AVR–07/10

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