ml670100 Oki Semiconductor, ml670100 Datasheet - Page 139

• Manufacturer Part Number: ml670100
• Description: Ml670100 Is A High-performance 32-bit Microcontroller
• Manufacturer: Oki Semiconductor

9.2.4
The CSI Test Control Register (CSTSCON) is an 8-bit read/write register that simplifies the
testing of serial port internals by looping each CSI channel's transmit output signal back to its
receive input signal.
After a system reset, this register contains 0x00. Leave it at this setting for normal operation.
Bit Descriptions
LBTST
This bit controls the looping of the transmit output signals back to the receive input signals.
Setting it to "1" sends each CSI channel's transmit output signal to both the output pin
(CSIn_TXD, n=0,1) and the receive input circuit. Resetting it to "0" causes the transmit and
receive functions to operate independently. The transmit output signals are not looped back to
the receive input signals.
CSI Test Control Register (CSTSCON)
LBTST
7
6
0
Figure 9.5 : CSI Test Control Register (CSTSCON)
A "0” indicates a reserved bit. Always write "0” to it.
Writing "1” produces unreliable operation.
5
0
4
0
3
0
2
0
1
0
0
1
0
0
Loop back test :disabled
Loop back test :enabled
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