Panasonic MN101C77C, F77G user manual Setup Example, IRQ2

Chapter 4 I/O Ports

4-11-4 Setup Example

A setup example of the port 6 synchronous output by the external interrupt 2 (IRQ2) is shown as follows. As it is operated, the initial output data of port 6 is "55", the synchronous output data is "AA", and the rising edge of the IRQ2 is selected at the synchronous event.

An example setup procedure, with description of each step is shown below.

	Setup Procedure		Description
(1)	Select the synchronous output		(1) Set the SYOEVS1-0 flag of the FLOAT register
	event.		to "00" to set the synchronous output event to
	FLOAT (x'3F2E')		the IRQ2.
	bp1-0	:SYOEVS1-0 = 00
(2)	Specify the interrupt edge.		(2) Set the REDG2 flag of the IRQ2ICR register to
	IRQ2ICR(x'3FE4')		"1" to set the active edge of the IRQ2 at the
	bp5	: REDG2 = 1	rising edge. Set the EDGSEL2 flag of the
	EDGDT(x'3F8F')		EDGDT register "0" to select the
	bp2	: EDGSEL2 = 0	programmable active edge interrupt.
(3)	Set the initial output data.		(3) Set the initial output data "55" to the P6OUT
	P6OUT(x'3F16')		register. Port 6 outputs "55".
	bp7-0	: P6OUT7-0 = x'55'
(4)	Set the synchronous output pin.		(4) Set port 6 to synchronous output pin by setting
	P6SYO(x'3F1E')		the P6SYO7-0 flag of the P6SYO register to
	bp7-0	: P6SYO7-0 = x'FF'	"FF". Select the output mode by setting the
	P6DIR(x'3F36')		P6DIR7-0 flag of the P6DIR register to "FF".
	bp7-0	: P6DIR7-0 = x'FF'
(5)	Set the synchronous output data.		(5) Set the synchronous output data "AA" to the
	P6OUT(x'3F16')		P6OUT register.
	bp7-0	: P6OUT7-0 = x'AA'
(6)	Event is generated.		(6) Port 6 outputs "AA" at the rising edge of
	Rising edge is generated at P22.		IRQ2.

IV - 52 Synchronous Output (Port 7)