ATMEGA48A-CCU Atmel, ATMEGA48A-CCU Datasheet - Page 109
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ATMEGA48A-CCU
Manufacturer Part Number
ATMEGA48A-CCU
Description
IC MCU AVR 4K FLASH VFBGA
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA48A-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
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 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-UFBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8271C–AVR–08/10
Table 14-7
rect PWM mode.
Table 14-7.
Note:
• Bits 3, 2 – Reserved
These bits are reserved bits in the ATmega48A/48PA/88A/88PA/168A/168PA/328/328P and will
always read as zero.
• Bits 1:0 – WGM01:0: Waveform Generation Mode
Combined with the WGM02 bit found in the TCCR0B 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
Table 14-8.
Notes:
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
Mode
COM0B1
0
1
2
3
4
5
6
7
0
0
1
1
1. A special case occurs when OCR0B equals TOP and COM0B1 is set. In this case, the Com-
2. BOTTOM = 0x00
1. MAX
WGM02
pare Match is ignored, but the set or clear is done at TOP. See
page 103
shows the COM0B1:0 bit functionality when the WGM02:0 bits are set to phase cor-
0
0
0
0
1
1
1
1
Compare Output Mode, Phase Correct PWM Mode
Waveform Generation Mode Bit Description
COM0B0
= 0xFF
for more details.
0
1
0
1
WGM01
0
0
1
1
0
0
1
1
Description
Normal port operation, OC0B disconnected.
Reserved
Clear OC0B on Compare Match when up-counting. Set OC0B on
Compare Match when down-counting.
Set OC0B on Compare Match when up-counting. Clear OC0B on
Compare Match when down-counting.
Table
WGM00
0
1
0
1
0
1
0
1
14-8. Modes of operation supported by the Timer/Counter
Timer/Counter
Mode of
Operation
Normal
PWM, Phase
Correct
CTC
Fast PWM
Reserved
PWM, Phase
Correct
Reserved
Fast PWM
”Modes of Operation” on page
OCRA
OCRA
OCRA
0xFF
0xFF
0xFF
TOP
–
–
(1)
”Phase Correct PWM Mode” on
Update of
Immediate
Immediate
BOTTOM
BOTTOM
OCRx at
TOP
TOP
–
–
100).
Set on
TOV Flag
BOTTOM
BOTTOM
MAX
MAX
MAX
TOP
–
–
(1)(2)
109
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