Panasonic MN101C77C, F77G user manual XII 38 Operation

Chapter 12 Serial Interface 3

	Setup Procedure		Description
(13)	Select the transfer clock.	(13)
	SC3MD1 (x'3FA9')		Set the SC3MST flag of the SC3MD1 register to
	bp2 : SC3MST = 1		"1" to select clock master (internal clock).
			At IIC communication, external clock should not
			be selected.
(14) Control the pin function.		(14) Set the SC3SBOS, SC3SBIS, SC3SBTS flags of
	SC3MD1 (x'3FA9')		the SC3MD1 register to "1" to set the SDA pin
	bp4 : SC3SBOS = 1		(the SBO3 pin) to serial data output, the SBI3 pin
	bp5 : SC3SBIS = 1		to serial data input, and the SCL pin (the SBT3
	bp6 : SC3SBTS = 1		pin)to serial clock I/O. Set the SC3IOM flag to "1"
	bp7 : SC3IOM = 1		to set "serial data input from the SDA pin (the
			SBO3 pin)".
(15)	Set the interrupt level.	(15)	Set the interrupt level by the SCLV1-0 flag of the
	SC3ICR (x'3FF9')		serial 3 interrupt control register (SC3ICR).
	bp7-6 : SC3LV1-0 = 10
(16) Enable the interrupt.		(16)	Enable the interrupt to the SC3IE flag of the
	SC3ICR (x'3FF9')		SC3ICR register. If the interrupt request flag
	bp1 : SC3IE = 1		(SC3IR of the SC3ICR register) is already set,
			clear SC3IR before the interrupt is enabled.
<Transmission is started.>		[	Chapter 3 3-1-4. Interrupt Flag Setup ]
(17)	Start serial transmission.	(17)	Set the transmission data to the transmit/
	Confirm that SCL (P52) is "H".		receive shift register SC3TRB. Then the
	Transmission data		transfer clock is generated to start transmission.
	→ SC3TRB (x'3FAB')		If the ACK bit is received after data transmission,
			the communication complete interrupt SC3IRQ is
			generated.
<Transmission is completed.>
<Setup for the next data transmission>
(18) Judge the monitor flag.		(18)	Confirm the SC3STC flag of the serial 3 control
	SC3CTR (x'3FAA')		register (SC3CTR). When the former
	bp6 : SC3STC		transmission is completed in normal, SC3STC =
			"0". If SC3STC = "1", the communication should
			be operated again.

XII - 38 Operation