HD6432646 Hitachi, HD6432646 Datasheet - Page 141

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

5.2.4
The ISCR registers are 16-bit readable/writable registers that select rising edge, falling edge, or
both edge detection, or level sensing, for the input at pins IRQ5 to IRQ0.
The ISCR registers are initialized to H'0000 by a reset and in hardware standby mode.
Bits 15 to 12—Reserved: These bits are always read as 0, and should only be written with 0.
Bits 11 to 0: IRQ5 Sense Control A and B (IRQ5SCA, IRQ5SCB) to IRQ0 Sense Control A and
B (IRQ0SCA, IRQ0SCB)
Bits 11 to 0
IRQ5SCB to
IRQ0SCB
0
1
Bit
Initial value
R/W
Bit
Initial value
R/W
ISCRH
ISCRL
IRQ Sense Control Registers H and L (ISCRH, ISCRL)
:
:
:
:
:
:
IRQ5SCA to
IRQ0SCA
0
1
0
1
IRQ3SCB
R/W
R/W
15
—
0
7
0
IRQ3SCA
R/W
R/W
14
—
0
6
0
Description
Interrupt request generated at IRQ5 to IRQ0 input low level
Interrupt request generated at falling edge of IRQ5 to IRQ0 input
Interrupt request generated at rising edge of IRQ5 to IRQ0 input
Interrupt request generated at both falling and rising edges of
IRQ5 to IRQ0 input
IRQ2SCB
R/W
R/W
13
—
0
5
0
IRQ2SCA
R/W
R/W
12
—
0
4
0
IRQ5SCB
IRQ1SCB
R/W
R/W
11
0
3
0
IRQ5SCA
IRQ1SCA
R/W
R/W
10
0
2
0
IRQ4SCB
IRQ0SCB
R/W
R/W
9
0
1
0
(initial value)
IRQ4SCA
IRQ0SCA
R/W
R/W
8
0
0
0
107