ATMEGA1284-PU Atmel, ATMEGA1284-PU Datasheet - Page 171
ATMEGA1284-PU
Manufacturer Part Number
ATMEGA1284-PU
Description
IC MCU AVR 128K FLASH 40PDIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA1284-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
32
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
16K 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
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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17.5.3
8272A–AVR–01/10
SPDR – SPI Data Register
The SPI Data Register is a read/write register used for data transfer between the Register File
and the SPI Shift Register. Writing to the register initiates data transmission. Reading the regis-
ter causes the Shift Register Receive buffer to be read.
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Bit
0x2E (0x4E)
Read/Write
Initial Value
MSB
R/W
7
X
R/W
X
6
R/W
5
X
R/W
X
4
R/W
X
3
R/W
X
2
R/W
X
1
LSB
R/W
X
0
Undefined
SPDR
171
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