Rev. 1.0, 02/00, page 103 of 1141
6.2.4
IRQ Edge Select Registers (IEGR)
0
0
1
0
R/W
2
0
R/W
3
0
4
0
R/W
5
0
0
7
—
—
R/W
R/W
R/W
IRQ4EG
R/W
IRQ5EG
IRQ3EG
IRQ2EG
IRQ1EG IRQ0EG1 IRQ0EG0
0
6
Bit :
Initial value :
R/W :
IEGR is an 8-bit readable/writable register that selects detected edge of the input at pins
,54
8
to
,54
3
.
IEGR register is initialized to H'00 by a reset.
Bit 7
Reserved: This bit is always read as 0. Do not write 1 to it.
Bits 6 to 2
,54
8
,54
8
,54
8
,54
8
to
,54
4
,54
4
,54
4
,54
4
Pins Detected Edge Select (IRQ5EG to IRQ1EG): These bits select
detected edge for interrupts
IRQ 5
to IRQ1.
Bits 6 to 2
IRQnEG
Description
0
Interrupt request generated at falling edge of
,54Q
pin input
(Initial value)
1
Interrupt request generated at rising edge of
,54Q
pin input
(n = 5 to 1)
Bits 1 and 0
,54
3
,54
3
,54
3
,54
3
Pin Detected Edge Select (IRQ0EG1, IRQ0EG0): These bits select
detected edge for interrupt
IRQ 0
.
Bit 1
Bit 0
IRQ0EG1
IRQ0EG0
Description
0
0
Interrupt request generated at falling edge of
,54
3
pin input (Initial
value)
0
1
Interrupt request generated at rising edge of
,54
3
pin input
1
*
Interrupt request generated at both falling and rising edges of
,54
3
pin
input
Note:
*
Don't care