Z8E520 Datasheet, PDF (36/43 Pages) Zilog, Inc. – 1.5 MBPS USB Device Controller

Z8E520/C520
1.5 MBPS USB Device Controller
Z8PLUS SYSTEM REGISTERS (Continued)
Zilog
0FB
IMR
D7
D6 D5 D4
D3 D2
D1 D0
1 = IRQ BIT N ENABLED
0 = IRQ BIT N MASKED
RESERVED (MUST BE 0)
1= GLOBAL INTERRUPTS ENABLED
0 = GLOBAL INTERRUPTS DISABLED
Figure 22. Interrupt Mask Register
0FF
STACK POINTER
D7
D6 D5 D4
D3 D2
D1 D0
NEXT STACK ADDRESSES
Figure 23. Stack Pointer
36
PRELIMINARY
DS97KEY2005