Fujitsu F2MC-16LX Hardware Manual page 398

CHAPTER 20 EXPANDED I/O SERIAL INTERFACE
[Bit 9] STOP (Stop bit)
This bit is used to forcibly interrupt serial transfer. Setting this bit to "1" will result in operation
stop because of STOP = 1.
STOP
0
1
• This bit is initialized to "0" at reset.
• This bit can be read and written.
[Bit 8] STRT: Start (start bit)
This bit is used to start serial transfer. Write "1" in the stopped state to start transfer. Writing
"1" will be ignored during serial transfer operation or when in serial shift register R/W wait
state.
• Writing "0" has no effect.
• Read operations always return "0".
[Bit 3] MODE (serial mode selection)
This bit selects the condition to start from the stopped state. Rewriting this bit during
operation is prohibited.
MODE
0
1
• This bit is initialized to "0" at reset.
• This bit can be read and written.
This bit is set to "1" at µDMA start.
•
[Bit 2] BDS: Bit Direction Select (Selection of transfer direction)
This bit selects whether to start transfer with the LSB side (LSB first) or MSB side (MSB first)
during input and output of serial data.
0
1
• This bit is initialized to "0" at reset.
• This bit can be read and written.
Note:
Specify the transfer direction before writing data to the SDR.
382
Operation
Normal operation
Stop of transfer because of STOP = 1. (initial value)
Operation
STRT = 1 will start operation. (initial value)
Started by reading/writing the serial data register.
LSB first (initial value)
MSB first