AT90PWM216-16SE ATMEL [ATMEL Corporation], AT90PWM216-16SE Datasheet - Page 183

• Manufacturer Part Number: AT90PWM216-16SE
• Description: 8-bit Microcontroller with 16K Bytes In-System Programmable flash
• Manufacturer: ATMEL [ATMEL Corporation]

17.2.6
17.3
7710D–AVR–08/09
Data Modes
SPI Data Register – SPDR
• Bits 7:0 - SPD7:0: SPI Data
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.
There are four combinations of SCK phase and polarity with respect to serial data, which are
determined by control bits CPHA and CPOL. The SPI data transfer formats are shown in
17-3
nal, ensuring sufficient time for data signals to stabilize. This is clearly seen by summarizing
Table 17-2
Table 17-5.
Figure 17-3. SPI Transfer Format with CPHA = 0
Bit
Read/Write
Initial Value
and
CPOL=0, CPHA=0
CPOL=0, CPHA=1
CPOL=1, CPHA=0
CPOL=1, CPHA=1
Figure
and
SCK (CPOL = 0)
mode 0
SCK (CPOL = 1)
mode 2
SAMPLE I
MOSI/MISO
CHANGE 0
MOSI PIN
CHANGE 0
MISO PIN
CPOL Functionality
SS
SPD7
Table
MSB first (DORD = 0)
LSB first (DORD = 1)
R/W
17-4. Data bits are shifted out and latched in on opposite edges of the SCK sig-
7
X
17-3, as done below:
SPD6
R/W
X
6
MSB
LSB
Sample (Falling)
SPD5
Sample (Rising)
R/W
Leading Edge
Setup (Falling)
Setup (Rising)
5
X
Bit 6
Bit 1
SPD4
R/W
X
4
Bit 5
Bit 2
SPD3
R/W
3
X
Bit 4
Bit 3
Sample (Falling)
Sample (Rising)
Setup (Falling)
Setup (Rising)
Trailing eDge
SPD2
Bit 3
Bit 4
R/W
AT90PWM216/316
X
2
Bit 2
Bit 5
SPD1
R/W
1
X
Bit 1
Bit 6
SPD0
R/W
X
0
SPI Mode
LSB
MSB
Undefined
0
1
2
3
SPDR
Figure
183