Panasonic MN101C77C, F77G user manual XII 26 Operation

Chapter 12 Serial Interface 3

Setup Procedure	Description
(15) Start serial transmission.	(15) Set the transmission data to the serial
Transmission data	transmit/receive shift register SC3TRB. The
→ SC3TRB (x'3FAB')	internal clock is generated to start
	transmission/reception.
	After the communication is finished, the serial 3
	interrupt SC3IRQ is generated.

Note : In the above settings, (6) to (9), (10) to (11),can be set at once.

If the communication is only for transmission, the data that input by setting the SC3SBIS of the SC3MD1 register to "0" should be fixed to "1". The SBI3 pin can be used as a general port.

If the communication is only for reception, set the SC3SBOS of the SC3MD1 register to "0" to select port. The SBO3 pin can be used as a general port.

If the communication is with 2 channels connected the SBO3/SBI3 pins, the SBO3 pin inputs/outputs serial data. The port direction control register P5DIR switches I/O.

At reception, set the SC3SBIS of the SC3MD1 register to "1" to select "input serial data". The SBI3 pin can be used as a general port.

It is possible to shut down the communication. When the communication should be stopped by force, set the SC3SBOS and the SC3SBIS of the SC3MD1 register to "0".

Setup for each flag should be done in order. The activation of communication should be operated after all control registers (table 12-2-1 : except SC3TRB) are set.

The SC3CKS register should set the transfer rate of the transfer clock to "under 2.5 MHz".

XII - 26 Operation