Renesas H8S/2158, User Manual

Page: 133 / 929

Section 5 Interrupt Controller
Rev. 3.00 Jan 25, 2006 page 79 of 872
REJ09B0286-0300
5.3.4 IRQ Sense Control Registers (ISCR16H, ISCR16L, ISCRH, ISCRL)
The ISCR registers select the source that generates an interrupt request at pins
IRQ15
to
IRQ0
or
pins
ExIRQ15
to
ExIRQ2
. Switching between pins
IRQ15
to
IRQ2
and pins
ExIRQ15
to
ExIRQ2
is performed by means of IRQ sense port select register 16 (ISSR16) and the IRQ sense port select
register (ISSR).
ISCR16H
Bit Bit Name Initial Value R/W Description
7
6 IRQ15SCB
IRQ15SCA 0
0 R/W
R/W
5
4 IRQ14SCB
IRQ14SCA 0
0 R/W
R/W
3
2 IRQ13SCB
IRQ13SCA 0
0 R/W
R/W
1
0 IRQ12SCB
IRQ12SCA 0
0 R/W
R/W
IRQn Sense Control B
IRQn Sense Control A
00: Interrupt request generated at low level of
IRQn
or
ExIRQn
input
01: Interrupt request generated at falling edge
of
IRQn
or
ExIRQn
input
10: Interrupt request generated at rising edge
of
IRQn
or
ExIRQn
input
11: Interrupt request generated at both falling
and rising edges of
IRQn
or
ExIRQn
input
(n = 15 to 12)
ISCR16L
Bit Bit Name Initial Value R/W Description
7
6 IRQ11SCB
IRQ11SCA 0
0 R/W
R/W
5
4 IRQ10SCB
IRQ10SCA 0
0 R/W
R/W
3
2 IRQ9SCB
IRQ9SCA 0
0 R/W
R/W
1
0 IRQ8SCB
IRQ8SCA 0
0 R/W
R/W
IRQn Sense Control B
IRQn Sense Control A
00: Interrupt request generated at low level of
IRQn
or
ExIRQn
input
01: Interrupt request generated at falling edge
of
IRQn
or
ExIRQn
input
10: Interrupt request generated at rising edge
of
IRQn
or
ExIRQn
input
11: Interrupt request generated at both falling
and rising edges of
IRQn
or
ExIRQn
input
(n = 11 to 8)