ATA6613 ATMEL Corporation, ATA6613 Datasheet - Page 192

• Manufacturer Part Number: ATA6613
• Description: Ata6613
• Manufacturer: ATMEL Corporation

6.16.2
192
ATA6612/ATA6613
Data Modes
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
6-67
nal, ensuring sufficient time for data signals to stabilize. This is clearly seen by summarizing
Table 6-67
Table 6-70.
Figure 6-67. SPI Transfer Format with CPHA = 0
Figure 6-68. SPI Transfer Format with CPHA = 1
and
CPOL=0, CPHA=0
CPOL=0, CPHA=1
CPOL=1, CPHA=0
CPOL=1, CPHA=1
MSB first (DORD = 0)
LSB first (DORD = 1)
Figure
SCK (CPOL = 0)
mode 0
SCK (CPOL = 1)
mode 2
SAMPLE I
MOSI/MISO
CHANGE 0
MOSI PIN
CHANGE 0
MISO PIN
SS
SCK (CPOL = 0)
mode 1
SCK (CPOL = 1)
mode 3
SAMPLE I
MOSI/MISO
CHANGE 0
MOSI PIN
CHANGE 0
MISO PIN
SS
and
MSB first (DORD = 0)
LSB first (DORD = 1)
CPOL Functionality
Table
6-68. Data bits are shifted out and latched in on opposite edges of the SCK sig-
6-68, as done below.
MSB
LSB
MSB
LSB
Sample (Falling)
Sample (Rising)
Leading Edge
Setup (Falling)
Setup (Rising)
Bit 6
Bit 1
Bit 6
Bit 1
Bit 5
Bit 2
Bit 5
Bit 2
Bit 4
Bit 3
Bit 4
Bit 3
Bit 3
Bit 4
Sample (Falling)
Sample (Rising)
Setup (Falling)
Trailing eDge
Setup (Rising)
Bit 3
Bit 4
Bit 2
Bit 5
Bit 2
Bit 5
Bit 1
Bit 6
Bit 1
Bit 6
LSB
MSB
9111C–AUTO–02/08
LSB
MSB
SPI Mode
0
1
2
3
Figure