ATMEGA169PA-AN Atmel, ATMEGA169PA-AN Datasheet - Page 168
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ATMEGA169PA-AN
Manufacturer Part Number
ATMEGA169PA-AN
Description
MCU AVR 384KB FLASH 16MHZ 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA169PA-AN
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K 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
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
Quantity
Price
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8284A–AVR–10/10
Flag, SPIF is set. If the SPI Interrupt Enable bit, SPIE, in the SPCR Register is set, an interrupt
is requested. The Slave may continue to place new data to be sent into SPDR before reading
the incoming data. The last incoming byte will be kept in the Buffer Register for later use.
Figure 18-2. SPI Master-slave Interconnection
The system is single buffered in the transmit direction and double buffered in the receive direc-
tion. This means that bytes to be transmitted cannot be written to the SPI Data Register before
the entire shift cycle is completed. When receiving data, however, a received character must be
read from the SPI Data Register before the next character has been completely shifted in. Oth-
erwise, the first byte is lost.
In SPI Slave mode, the control logic will sample the incoming signal of the SCK pin. To ensure
correct sampling of the clock signal, the minimum low and high period should be:
Low period: longer than 2 CPU clock cycles.
High period: longer than 2 CPU clock cycles.
When the SPI is enabled, the data direction of the MOSI, MISO, SCK, and SS pins is overridden
according to
Functions” on page
Table 18-1.
Note:
ATmega169A/169PA/329A/329PA/649A/649P/3290A/3290PA/6490A/6490P
MOSI
MISO
SCK
Pin
SS
1. See
direction of the user defined SPI pins.
Table
SPI Pin Overrides
”Alternate Functions of Port B” on page 75
Direction, Master SPI
User Defined
Input
User Defined
User Defined
18-1. For more details on automatic port overrides, refer to
72.
(1)
for a detailed description of how to define the
Direction, Slave SPI
Input
User Defined
Input
Input
SHIFT
ENABLE
”Alternate Port
168
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