Texas Instruments CC2650DK Benutzerhandbuch
SSI Registers
20.7.1.2 CR1 Register (Offset = 4h) [reset = X]
CR1 is shown in
and described in
Control 1
Figure 20-14. CR1 Register
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
RESERVED
R-X
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RESERVED
SOD
MS
SSE
LBM
R-X
R/W-X
R/W-X
R/W-X
R/W-X
Table 20-4. CR1 Register Field Descriptions
Bit
Field
Type
Reset
Description
31-4
RESERVED
R
X
Software should not rely on the value of a reserved. Writing any
other value than the reset value may result in undefined behavior.
other value than the reset value may result in undefined behavior.
3
SOD
R/W
X
Slave-mode output disabled This bit is relevant only in the slave
mode, MS=1. In multiple-slave systems, it is possible for an SSI
master to broadcast a message to all slaves in the system while
ensuring that only one slave drives data onto its serial output line. In
such systems the RXD lines from multiple slaves could be tied
together. To operate in such systems, this bitfield can be set if the
SSI slave is not supposed to drive the TXD line: 0: SSI can drive the
TXD output in slave mode. 1: SSI cannot drive the TXD output in
slave mode.
mode, MS=1. In multiple-slave systems, it is possible for an SSI
master to broadcast a message to all slaves in the system while
ensuring that only one slave drives data onto its serial output line. In
such systems the RXD lines from multiple slaves could be tied
together. To operate in such systems, this bitfield can be set if the
SSI slave is not supposed to drive the TXD line: 0: SSI can drive the
TXD output in slave mode. 1: SSI cannot drive the TXD output in
slave mode.
2
MS
R/W
X
Master or slave mode select. This bit can be modified only when SSI
is disabled, SSE=0.
is disabled, SSE=0.
0h = Device configured as master
1h = Device configured as slave
1
SSE
R/W
X
Synchronous serial interface enable.
0h = SSI_DISABLED : Operation disabled
1h = SSI_ENABLED : Operation enabled
0
LBM
R/W
X
Loop back mode: 0: Normal serial port operation enabled. 1: Output
of transmit serial shifter is connected to input of receive serial shifter
internally.
of transmit serial shifter is connected to input of receive serial shifter
internally.
1369
SWCU117A – February 2015 – Revised March 2015
Synchronous Serial Interface (SSI)
Copyright © 2015, Texas Instruments Incorporated