ATMEGA48-20PI Atmel, ATMEGA48-20PI Datasheet - Page 86

IC AVR MCU 4K 5V 20MHZ 28-DIP

ATMEGA48-20PI

Manufacturer Part Number
ATMEGA48-20PI
Description
IC AVR MCU 4K 5V 20MHZ 28-DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets

Specifications of ATMEGA48-20PI

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)
2.7 V ~ 5.5 V
Data Converters
A/D 6x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA48-24PI
ATMEGA48-24PI
13.4
13.4.1
13.4.2
13.4.3
13.4.4
13.4.5
13.4.6
13.4.7
86
Register Description
ATmega48/88/168
MCUCR – MCU Control Register
PORTB – The Port B Data Register
DDRB – The Port B Data Direction Register
PINB – The Port B Input Pins Address
PORTC – The Port C Data Register
DDRC – The Port C Data Direction Register
PINC – The Port C Input Pins Address
• Bit 4 – PUD: Pull-up Disable
When this bit is written to one, the pull-ups in the I/O ports are disabled even if the DDxn and
PORTxn Registers are configured to enable the pull-ups ({DDxn, PORTxn} = 0b01). See
figuring the Pin” on page 71
Bit
0x35 (0x55)
Read/Write
Initial Value
Bit
0x05 (0x25)
Read/Write
Initial Value
Bit
0x04 (0x24)
Read/Write
Initial Value
Bit
0x03 (0x23)
Read/Write
Initial Value
Bit
0x08 (0x28)
Read/Write
Initial Value
Bit
0x07 (0x27)
Read/Write
Initial Value
Bit
0x06 (0x26)
Read/Write
Initial Value
PORTB7
PINB7
DDB7
R/W
R/W
N/A
R
7
0
R
R
R
R
7
0
7
0
7
7
0
7
0
7
0
PORTB6
PORTC6
PINB6
PINC6
DDB6
DDC6
R/W
R/W
R/W
R/W
N/A
N/A
R
R
R
6
0
6
0
6
0
6
6
0
6
0
6
for more details about this feature.
PORTB5
PORTC5
PINB5
PINC5
DDB5
DDC5
R/W
R/W
R/W
R/W
N/A
N/A
R
R
5
0
5
0
5
5
0
5
0
5
R
5
0
PORTB4
PORTC4
PINB4
PINC4
DDB4
DDC4
R/W
R/W
R/W
R/W
N/A
N/A
R
R
4
0
4
0
4
4
0
4
0
4
PUD
R/W
4
0
PORTB3
PORTC3
PINB3
PINC3
DDB3
DDC3
R/W
R/W
R/W
R/W
N/A
N/A
R
R
3
0
3
0
3
3
0
3
0
3
R
3
0
PORTB2
PORTC2
PINB2
PINC2
DDB2
DDC2
R/W
R/W
R/W
R/W
N/A
N/A
R
R
2
0
2
0
2
2
0
2
0
2
R
2
0
PORTB1
PORTC1
PINB1
PINC1
DDB1
DDC1
R/W
R/W
R/W
R/W
IVSEL
N/A
N/A
R/W
R
R
1
0
1
0
1
1
0
1
0
1
1
0
PORTB0
PORTC0
PINB0
PINC0
DDB0
DDC0
IVCE
R/W
R/W
R/W
R/W
R/W
N/A
N/A
R
R
0
0
0
0
0
0
0
0
0
0
0
0
2545S–AVR–07/10
MCUCR
PORTB
PORTC
DDRB
DDRC
PINB
PINC
“Con-

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