Rev. 1.0, 02/00, page 100 of 1141
6.2
Register Descriptions
6.2.1
System Control Register (SYSCR)
0
0
1
0
—
2
0
—
3
1
R
4
0
R/W
5
0
R
0
7
—
—
XRST
INTM0
INTM1
0
6
—
—
—
—
—
—
Bit :
Initial value :
R/W :
SYSCR is an 8-bit readable register that selects the interrupt control mode.
Only bits 5, 4, 2 and 1 are described here; for details on the other bits, see section 3.2.2, System
Control Register (SYSCR).
SYSCR is initialized to H'08 by a reset.
Bits 5 and 4
Interrupt Control Mode (INTM1, INTM0): These bits select one of two
interrupt control modes for the interrupt controller. The INTM1 bit must not be set to 1.
Bit 5
Bit 4
INTM1
INTM0
Interrupt Control
Mode
Description
0
0
Interrupts are controlled by I bit (Initial value)
0
1
1
Interrupts are controlled by I and UI bits and ICR
0
Cannot be used in this LSI
1
1
Cannot be used in this LSI