Computer Hardware User Manual

Table Of Contents
Programming Model
http://www.motorola.com/computer/literature 3-49
3
Interrupt Mask Level Register
MSK2-MSK0 Interrupt Mask Level - The interrupt mask level bits
determine the level which must be exceeded by IPL2-
IPL0 in order for the PCCchip2 to assert its INT pin. The
MSK bits are encoded as follows:
ADR/SIZ $FFF4203F (8 bits)
BIT 76543210
NAME MSK2 MSK1 MSK0
OPER RRRRRR/WR/WR/W
RESET 000001 PL1 PL1 PL
MSK2
MSK1 MSK0 Priority Level Comments
0 0 0 0 Lowest Level
001 1
010 2
011 3
100 4
101 5
110 6
1 1 1 7 Highest Level