HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 437

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

SYSCR1—System Control Register 1
Bit
Initial value
Read/Write
—
—
7
1
IRQ
R/W
Interrupt Request 1 Enable
0 P1
1 P1
6
0
1
E
6
6
IRQ
is an I/O port; IRQ
is the IRQ
R/W
Interrupt Request 0 Enable
5
0
0 P1
1 P1
0
E
5
5
NMIEG
427
1
R/W
is an I/O port; IRQ
is the IRQ
Nonmaskable Interrupt Edge
input pin.
4
0
0 An NMI request is generated on the
1 An NMI request is generated on the
falling edge of the NMI pin input.
rising edge of the NMI pin input.
H'FEFC
1
BRLE
input is disabled.
R/W
0
Bus Release Enable
3
0
input pin.
0 P1
1 P1
P1
2
2
3
0
and P1
is the BACK output pin and
is the BREQ input pin.
input is disabled.
—
—
2
1
3
are I/O ports.
—
—
1
1
Port 1
—
—
0
1