ATMEGA128A-AUR Atmel, ATMEGA128A-AUR Datasheet - Page 171

• Manufacturer Part Number: ATMEGA128A-AUR
• Description: MCU AVR 128K FLASH 16MHZ 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA128A-AUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 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

19.5
19.5.1
8151H–AVR–02/11
Register Description
SPCR - SPI Control Register
Figure 1. SPI Transfer Format with CPHA = 0
Figure 2. SPI Transfer Format with CPHA = 1
• Bit 7 – SPIE: SPI Interrupt Enable
This bit causes the SPI interrupt to be executed if SPIF bit in the SPSR Register is set and the if
the global interrupt enable bit in SREG is set.
• Bit 6 – SPE: SPI Enable
When the SPE bit is written to one, the SPI is enabled. This bit must be set to enable any SPI
operations.
Bit
Read/Write
Initial Value
SCK (CPOL = 0)
mode 1
SCK (CPOL = 1)
mode 3
SAMPLE I
MOSI/MISO
CHANGE 0
MOSI PIN
CHANGE 0
MISO PIN
SS
SCK (CPOL = 0)
mode 0
SCK (CPOL = 1)
mode 2
SAMPLE I
MOSI/MISO
CHANGE 0
MOSI PIN
CHANGE 0
MISO PIN
SS
MSB first (DORD = 0)
LSB first (DORD = 1)
MSB first (DORD = 0)
LSB first (DORD = 1)
SPIE
R/W
7
0
SPE
R/W
MSB
LSB
6
0
MSB
LSB
DORD
Bit 6
Bit 1
R/W
5
0
Bit 6
Bit 1
Bit 5
Bit 2
MSTR
R/W
4
0
Bit 5
Bit 2
Bit 4
Bit 3
CPOL
R/W
Bit 4
Bit 3
3
0
Bit 3
Bit 4
CPHA
Bit 3
Bit 4
R/W
2
0
Bit 2
Bit 5
Bit 2
Bit 5
SPR1
ATmega128A
R/W
1
0
Bit 1
Bit 6
Bit 1
Bit 6
SPR0
R/W
0
0
LSB
MSB
LSB
MSB
SPCR
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