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CHAPTER 17 EXTENDED I/O SERIAL INTERFACE
17.2 Register in Extended I/O Serial Interface
[bit9] 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 "1" at reset.
• This bit can be read and written.
[bit8] 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.
[bit7 to bit4] Undefined bits
The read value is undefined. Nothing is affected when it is written.
[bit3] 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.
372
Forwarding stop [Initial value] by STOP=1
Started when STRT = 1. [Initial value]
Started by reading or writing the serial data register.
FUJITSU MICROELECTRONICS LIMITED
MB90335 Series
Operation
Normal Operation
Operation
CM44-10137-6E
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