Fujitsu F2MC-16LX Hardware Manual page 480

CHAPTER 20 EXTENDED I/O SERIAL INTERFACE
[bit 9] STOP (stop bit)
This bit forcibly suspends serial transfer. When this bit is "1", the state changes into HALT based on
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)
It is a bit by which the serial transfer is started. Forwarding is begun by writing "1" in the stopped state.
Lines specified as "1" are ignored, where serial transfer operation is on-going and the state is in serial
shift register R/W WAIT.
• Writing "0" is not significant.
• The bit always returns "0" when read.
[bit 7 to bit 4] Undefined bit
The read value is irregular. Nothing is affected when it is written.
[bit 3] MODE (serial mode selection)
The startup condition from the stopped state is selected. However, rewriting under the operation is a
interdiction.
MODE
0
1
• This bit is initialized to "0" at reset.
• This bit can be read and written.
• This bit set to "1" at µDMAC start.
[bit 2] BDS: Bit Direction Selection (transfer direction selection)
On input and output of the serial data, Select either of the following alternatives: transfer in ascending
order from the least significant bit (LSB first); transfer in descending order from the most significant bit
(MSB first).
BDS
0
1
• This bit is initialized to "0" at reset.
• This bit can be read and written.
464
Normal Operation
Forwarding stop [Initial value] by STOP=1
Started when STRT = 1. [Initial value]
Started by reading or writing the serial data register.
LSB first [Initial value]
MSB first
Operation
Operation
Operation