Motorola MVME172 ユーザーズマニュアル
Programming Model
http://www.mcg.mot.com/literature
3-23
3
SCC Interrupt Control Register
IL2-IL0
These three bits select the interrupt level for the SCC
controller. Level 0 does not generate an interrupt.
controller. Level 0 does not generate an interrupt.
IEN
When this bit is set high, the interrupt is enabled. The
interrupt is disabled when this bit is low.
interrupt is disabled when this bit is low.
INT
This bit reflects the state of the INT pin from either
Z85230 controller (qualified by the IEN bit). When this
bit is high, an SCC controller interrupt is being generated
at the level programmed in IL2-IL0. When the interrupt is
cleared in the Z85230, INT returns to zero. During the
interrupt acknowledge cycle, interrupts from the first
Z85230 have priority over those from the second Z85230.
Z85230 controller (qualified by the IEN bit). When this
bit is high, an SCC controller interrupt is being generated
at the level programmed in IL2-IL0. When the interrupt is
cleared in the Z85230, INT returns to zero. During the
interrupt acknowledge cycle, interrupts from the first
Z85230 have priority over those from the second Z85230.
ADR/SIZ
$FFF4201C (8 bits)
BIT
23
22
21
20
19
18
17
16
NAME
INT
IEN
IL2
IL1
IL0
OPER
R
R
R
R/W
R
R/W
R/W
R/W
RESET
0
0
0 PL
0 PL
0
0 PL
0 PL
0 PL