HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 107

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

5.2.4 IRQ Enable Register (IER)
IER is an 8-bit readable/writable register that enables or disables IRQ
IER is initialized to H'00 by a reset and in hardware standby mode.
Bits 7 and 6—Reserved: These bits can be written and read, but they do not enable or disable
interrupts.
Bits 5 to 0—IRQ
IRQ
Bits 5 to 0
IRQ5E to IRQ0E
0
1
Bit
Initial value
Read/Write
5
to IRQ
0
interrupts.
Reserved bits
R/W
5
—
7
0
to IRQ
Description
IRQ
IRQ
5
5
to IRQ
to IRQ
0
R/W
Enable (IRQ5E to IRQ0E): These bits enable or disable
—
6
0
0
0
interrupts are disabled
interrupts are enabled
IRQ5E
R/W
5
0
IRQ to IRQ enable
These bits enable or disable IRQ to IRQ interrupts
IRQ4E
R/W
93
4
0
5
IRQ3E
R/W
0
3
0
IRQ2E
R/W
0
2
0
to IRQ
IRQ1E
5
R/W
5
1
0
interrupt requests.
(Initial value)
IRQ0E
0
R/W
0
0