mc33879ek/r2 Freescale Semiconductor, Inc, mc33879ek/r2 Datasheet - Page 17

• Manufacturer Part Number: mc33879ek/r2
• Description: Configurable Octal Serial Switch With Open Load Detect Current Disable
• Manufacturer: Freescale Semiconductor, Inc

sent to the 33879 and a 16-bit status word is received from
the 33879. The MSB is sent and received first. As
shows, the Command Register defines the position and
operation the 33879 will perform on rising edge of
Open Load, or T
Analog Integrated Circuit Device Data
Freescale Semiconductor
Bit 15
Bit 15
Detect
MSB
MSB
Open
Load
OFF
ON /
On each SPI communication, a 16-bit command word is
0 = Bits 0 to 7, Output commanded OFF.
0 = Bits 8 to 15, Open Load Detection Current OFF.
0 = Bits 0 to 7, No Fault at Output.
1 = Bits 0 to 7, Output Short-to-Battery, Short-to-GND,
8
0
Microcontroller
SPI Interface
MC68HCxx
Parallel
Ports
with
Bit 14
Bit 14
Detect
Open
Load
ON /
OFF
Figure 17. Parallel Input SPI Control
7
0
C
A
B
LIM
Bit 13
Bit 13
Detect
MOSI
SCLK
MISO
Open
Load
ON /
OFF
6
0
.
Bit 12
Bit 12
Detect
Open
Load
ON /
OFF
5
0
Bit 11
Bit 11
Detect
Open
Load
ON /
OFF
4
0
SCLK
DO
DI
SCLK
DO
DI
CS
DI
SCLK
DO
Bit 10
Bit 10
CS
CS
Detect
Open
Load
ON /
OFF
Table 6. Command Register Definition
3
0
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Table 7. Fault Register Definition
Detect
Bit 9
Bit 9
Open
Load
ON /
OFF
Table 6
CS
2
0
8 Outputs
8 Outputs
8 Outputs
. The
SPI DEFINITION
Detect
Bit 8
Bit 8
Open
Load
ON /
OFF
1
0
OUT 8
OUT 8
Status
Bit 7
Bit 7
ON /
OFF
Fault Register, shown in
status of the output driver.
and the method by which the fault is communicated to the
microprocessor.
1 = Bits 0 to 7, Output commanded ON.
1 = Bits 8 to 15 Open Load Detection Current ON.
Bits 8 to 15 will always return “0”.
OUT 7
OUT 7
Status
Bit 6
Bit 6
ON /
OFF
OUT 6
OUT 6
Status
Bit 5
Bit 5
ON /
OFF
OUT 5
OUT 5
Status
Bit 4
Bit 4
ON /
OFF
Table
Table 8
OUT 4
OUT 4
Bit 3
Bit 3
Status
OFF
7, defines the previous state
ON /
FUNCTIONAL DESCRIPTION
identifies the type of fault
OUT 3
OUT 3
Bit 2
Bit 2
Status
OFF
ON /
SPI DEFINITION
OUT 2
OUT 2
Status
Bit 1
Bit 1
OFF
ON /
OUT 1
OUT 1
Status
Bit 0
Bit 0
LSB
LSB
OFF
ON /
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