ATA6602 ATMEL Corporation, ATA6602 Datasheet - Page 187
ATA6602
Manufacturer Part Number
ATA6602
Description
LIN and Microcontroller System-In-Package: LIN Transceiver, integrated 5V/50 mA voltage regulator, window watchdog and automotive AVR ATmega88 (8 kBytes Flash); green QFN48 package.
Manufacturer
ATMEL Corporation
Datasheet
1.ATA6602.pdf
(362 pages)
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4921C–AUTO–01/07
Table 4-67.
Table 4-68.
Table 4-69.
• Bit 4 – MSTR: Master/Slave Select
• Bit 3 – CPOL: Clock Polarity
• Bit 2 – CPHA: Clock Phase
• Bits 1, 0 – SPR1, SPR0: SPI Clock Rate Select 1 and 0
This bit selects Master SPI mode when written to one, and Slave SPI mode when written
logic zero. If SS is configured as an input and is driven low while MSTR is set, MSTR will be
cleared, and SPIF in SPSR will become set. The user will then have to set MSTR to
re-enable SPI Master mode.
When this bit is written to one, SCK is high when idle. When CPOL is written to zero, SCK is
low when idle. Refer to
is summarized below:
The settings of the Clock Phase bit (CPHA) determine if data is sampled on the leading
(first) or trailing (last) edge of SCK. Refer to
The CPOL functionality is summarized below:
These two bits control the SCK rate of the device configured as a Master. SPR1 and SPR0
have no effect on the Slave. The relationship between SCK and the Oscillator Clock fre-
quency f
SPI2X
0
0
0
0
1
1
1
1
CPOL
CPHA
osc
CPOL Functionality
CPHA Functionality
Relationship Between SCK and the Oscillator Frequency
0
1
0
1
is shown in the following table:
SPR1
Figure 4-67
0
0
1
1
0
0
1
1
Leading Edge
Leading Edge
and
Sample
Falling
Rising
Setup
Figure 4-68
SPR0
0
1
0
1
0
1
0
1
Figure 4-67
for an example. The CPOL functionality
SCK Frequency
f
f
f
f
f
f
f
f
osc
osc
osc
osc
osc
osc
osc
osc
/
/
/
/
/
/
/
/
ATA6602/ATA6603
4
16
64
128
2
8
32
64
and
Figure 4-68
Trailing Edge
Trailing Edge
Sample
Falling
Rising
Setup
for an example.
187
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