ATMEGA48A-PU Atmel, ATMEGA48A-PU Datasheet - Page 18

IC MCU AVR 4K FLASH 28PDIP

ATMEGA48A-PU

Manufacturer Part Number
ATMEGA48A-PU
Description
IC MCU AVR 4K FLASH 28PDIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets

Specifications of ATMEGA48A-PU

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 6x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-DIP (0.300", 7.62mm)
Controller Family/series
Atmega
No. Of I/o's
23
Eeprom Memory Size
256Byte
Ram Memory Size
512Byte
Cpu Speed
20MHz
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA48A-PU
Manufacturer:
Microchip Technology
Quantity:
1 051
7.3
8271C–AVR–08/10
SRAM Data Memory
Figure 7-3
is organized.
The ATmega48A/48PA/88A/88PA/168A/168PA/328/328P is a complex microcontroller with
more peripheral units than can be supported within the 64 locations reserved in the Opcode for
the IN and OUT instructions. For the Extended I/O space from 0x60 - 0xFF in SRAM, only the
ST/STS/STD and LD/LDS/LDD instructions can be used.
The lower 768/1280/1280/2303 data memory locations address both the Register File, the I/O
memory, Extended I/O memory, and the internal data SRAM. The first 32 locations address the
Register File, the next 64 location the standard I/O memory, then 160 locations of Extended I/O
memory, and the next 512/1024/1024/2048 locations address the internal data SRAM.
The five different addressing modes for the data memory cover: Direct, Indirect with Displace-
ment, Indirect, Indirect with Pre-decrement, and Indirect with Post-increment. In the Register
File, registers R26 to R31 feature the indirect addressing pointer registers.
The direct addressing reaches the entire data space.
The Indirect with Displacement mode reaches 63 address locations from the base address given
by the Y- or Z-register.
When using register indirect addressing modes with automatic pre-decrement and post-incre-
ment, the address registers X, Y, and Z are decremented or incremented.
The 32 general purpose working registers, 64 I/O Registers, 160 Extended I/O Registers, and
t h e
ATmega48A/48PA/88A/88PA/168A/168PA/328/328P are all accessible through all these
addressing modes. The Register File is described in
11.
Figure 7-3.
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
5 1 2 / 1 0 2 4 / 1 0 2 4 / 2 0 4 8
shows how the ATmega48A/48PA/88A/88PA/168A/168PA/328/328P SRAM Memory
Data Memory Map
(512/1024/1024/2048 x 8)
160 Ext I/O Reg.
64 I/O Registers
Data Memory
Internal SRAM
32 Registers
b y t e s
o f
i n t e r n a l
0x02FF/0x04FF/0x4FF/0x08FF
0x0000 - 0x001F
0x0020 - 0x005F
0x0060 - 0x00FF
0x0100
”General Purpose Register File” on page
d a t a
S R A M
i n
t h e
18

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