Fujitsu FR81S User Manual
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
71
CS2SCINV
Serial chip select pin 2
Serial clock invert bit
0
Mark level "H" format
1
Mark level "L" format
Notes:
⋅
This bit can be changed only when transmission and reception are disabled (SCR:TXE=RXE="0").
⋅
In the slave mode (SCR:MS="0"), setting this bit has no effect.
⋅
When data format of chip select is disabled (ESCR:CSFE="0"), setting this bit has no effect.
[bit13] CS2SPI: SPI support bit for chip select 2
If data format of chip select is enabled (ESCR:CSFE="1"), this bit is used to execute an SPI communication
when the serial chip select pin 2 is active.
⋅
When this bit is set to "0": Normal synchronous communication
⋅
When this bit is set to "1": SPI communication supported.
CS2SPI
Serial chip select pin 2
SPI support bit
0
Normal synchronous transfer
1
SPI supported
Notes:
⋅
This bit can be changed only when transmission and reception are disabled (SCR:TXE=RXE="0").
⋅
In the slave mode (SCR:MS="0"), setting this bit has no effect.
⋅
When data format of chip select is disabled (ESCR:CSFE="0"), setting this bit has no effect.
[bit12] CS2BDS: Transfer direction select bit for chip select 2
If data format of chip select is enabled (ESCR:CSFE="1"), this bit is used to select whether to transfer the
transfer serial data from the least significant bit (LSB first, BDS="0") or from the most significant bit (MSB
first, BDS="1") when the serial chip select pin 2 is active.
CS2BDS
Serial chip select pin 2
Transfer direction select bit
0
LSB first (transfer from the least significant bit)
1
MSB first (transfer from the most significant bit)
Notes:
⋅
This bit can be changed only when transmission and reception are disabled (SCR:TXE=RXE="0").
⋅
In the slave mode (SCR:MS="0"), setting this bit has no effect.
⋅
When data format of chip select is disabled (ESCR:CSFE="0"), setting this bit has no effect.
[bit11 to bit8] CS2 L3, L2, L1, L0: Data length select bits for chip select 2
If data format of chip select is enabled (ESCR:CSFE="1"), these bits are used to specify the data length of
transmission/reception data when the serial chip select pin 2 is active.
MB91520 Series
MN705-00010-1v0-E
1384