ATMEGA48PA-PN Atmel, ATMEGA48PA-PN Datasheet - Page 168

• Manufacturer Part Number: ATMEGA48PA-PN
• Description: MCU AVR 4KB FLASH 20MHZ 28PDIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA48PA-PN

• 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: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8161D–AVR–10/09
When the SPI is enabled, the data direction of the MOSI, MISO, SCK, and SS pins is overridden
according to
”Alternate Port Functions” on page
Table 18-1.
Note:
The following code examples show how to initialize the SPI as a Master and how to perform a
simple transmission. DDR_SPI in the examples must be replaced by the actual Data Direction
Register controlling the SPI pins. DD_MOSI, DD_MISO and DD_SCK must be replaced by the
actual data direction bits for these pins. E.g. if MOSI is placed on pin PB5, replace DD_MOSI
with DDB5 and DDR_SPI with DDRB.
MOSI
MISO
SCK
Pin
SS
See
direction of the user defined SPI pins.
”Alternate Functions of Port B” on page 82
Table 18-1 on page
SPI Pin Overrides
Direction, Master SPI
User Defined
Input
User Defined
User Defined
(Note:)
ATmega48PA/88PA/168PA/328P
168. For more details on automatic port overrides, refer to
80.
for a detailed description of how to define the
Direction, Slave SPI
Input
User Defined
Input
Input
168