Texas Instruments TMS320C645x manual Set Falling Edge Interrupt Register Setfaltrig

Registers

5.9Set Falling Edge Interrupt Register (SET_FAL_TRIG)

The GPIO falling trigger register (FAL_TRIG) configures the edge detection logic to trigger GPIO interrupts and EDMA events on the falling edge of GPIO signals. Setting a bit to 1 in FAL_TRIG causes the corresponding GPIO interrupt and EDMA event (GPINTn) to be generated on the falling edge of GPn. FAL_TRIG is not directly accessible by the CPU; it must be configured using the GPIO set falling trigger and clear falling trigger registers.

The GPIO set falling trigger register (SET_FAL_TRIG) is shown in Figure 11 and described in Table 11. Writing a 1 to a bit of SET_FAL_TRIG sets the corresponding bit in FAL_TRIG. Writing a 0 has no effect. Reading SET_FAL_TRIG returns the value in FAL_TRIG.

Figure 11. Set Falling Edge Interrupt Register (SET_FAL_TRIG)

31							16
			Reserved
			R-0
15	14	13	12	11	10	9	8
SETFAL15	SETFAL14	SETFAL13	SETFAL12	SETFAL11	SETFAL10	SETFAL9	SETFAL8
R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0
7	6	5	4	3	2	1	0
SETFAL7	SETFAL6	SETFAL5	SETFAL4	SETFAL3	SETFAL2	SETFAL1	SETFAL0
R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0

Legend: R = Read only; R/W = Read/Write; -n= value after reset

Table 11. Set Falling Edge Interrupt Register (SET_FAL_TRIG) Field Descriptions

Bit	Field	Value	Description
31−16	Reserved	0	Reserved. The reserved bit location is always read as zero. A value
			written to this field has no effect.
15−0	SETFALn		Writing a 1 enables the falling edge detection for the corresponding GPn
			pin. Reading this register returns the state of the FAL_TRIG register.
		0	No effect
		1	Sets the corresponding bit in FAL_TRIG

24 General-Purpose Input/Output (GPIO) SPRU724