Datasheet

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REGISTER ACCESS (Control Byte 0 with R/ W Bit)
ReadRegisterViaControlByte0
SCLK
SDI
(MOSI)
SDO
(MISO)
MSB
MSB LSB
Hi-Z Hi-Z
L BS
D7
0 A3 A2 A1 A0 1 0
D15 D14 D13 D9 D8 D4 D0
D6 D5 D4 D3 D2 D1 D0
654321 1 387 2 161587
CS
( )SS
D5
11
D1
WritetoRegisterViaControlByte0
SCLK
SDI
(MOSI)
SDO
(MISO)
MSB LSB
Hi-Z
D7
0 A3 A2 A1 A0 0
D6 D5 D4 D3 D2 D1 D0
654321 1 387 2 161587
CS
( )SS
11
MSB L BS
D15 D14 D13 D9 D8 D4 D0D5 D1
12
TSC2005
SBAS379C – DECEMBER 2006 – REVISED MARCH 2008
Control byte 0, beginning with D7 = 0, is used to access the internal registers. This control byte uses the last bit,
D0, to control the flow of data. If D0 is '1', then the content of the register pointed by the address bits (A3-A0) is
output to SDO (MISO) in the next cycle. Otherwise, the data coming from SDI (MOSI) are written to the register
properly pointed to by the address bits in the control byte (if the write mode is available for the pointed register).
After Control Byte 0 with Read/Write Bit followed by a 16-bit word on SDO/SDI completes, the master can hold
CS low to send another Control Byte 0 with Read/Write Bit followed by a 16-bit word on SDO/SDI as many times
as the master is able to operate.
Figure 29. Interface Timing — Sending Control Byte 0 with Read Bit
Figure 30. Interface Timing — Sending Control Byte 0 with Write Bit
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