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R01UH0336EJ0102 Rev.1.02
Page 1187 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 21 Clocked Serial Interface G (CSIG)
21.3.10
Loop-Back Mode
Loop-back mode is a special mode for self-testing. This feature is only
available in master mode.
During operation in this mode, the transmission and reception signal lines are
internally connected, as shown in the figures below. The CSIGnTSCK,
CSIGnTSO, and CSIGnTSI signals are disconnected from the port pins. In
addition, the CSIGnTSO output is fixed to the low level, and CSIGnTSCK is set
to the inactive state. The rest of CSIG works as in normal operation.
In order to test the CSIG, set the CSIGnCTL1.CSIGnLBM bit to 1, carry out
normal transfer operations, and then check that the received data is the same
as the transmitted data.
Figure 21-19
Normal Operation
Figure 21-20
Operation in Loop-Back Mode
CSIGnTSCK
CSIGnTSO
Tx
Rx
CSIGnTSI
Shift register
Clock
CSIGnTSCK
CSIGnTSO
Tx
Rx
CSIGnTSI
Shift register
Clock
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