Fujitsu FR81S User Manual
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
6. Operation of CSIO
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
237
6.2.7. Test Mode
This section explains the operation of the test mode.
Serial Test Mode
When the serial test mode is enabled (SACSR:STST="1"), SOUT and SIN are connected inside the
multi-function serial interface, and then the data sent from SOUT can be received from SIN directly.
When the serial test mode is enabled (SACSR:STST="1"), the SOUT pin is fixed to "H", and the data input
to the SIN pin is ignored.
Figure 6-30 Serial Test Mode
SOUT pin
SIN pin
SOUT
SIN
H
Multi-function
serial interface
serial interface
Note:
The serial test mode enable bit (SACSR:STST) can be changed only when transmission and reception are
disabled (SCR:TXE=RXE="0").
MB91520 Series
MN705-00010-1v0-E
1550