Z86U18 Datasheet, PDF (20/30 Pages) Zilog, Inc. – USB Device Controller with CMOS Z86K15 MCU

Z86U18
USB Device Controller with CMOS Z86K15 MCU
Z8 CONTROL REGISTER DIAGRAMS (Continued)
Zilog
R251 IMR
D7 D6 D5 D4 D3 D2 D1 D0
1 Enables IRQ5-IRQ0
(D0 = IRQ0)
Reserved (Must be 0)
1=Global Interrupt Enable
0=Global Interrupt Disable
Figure 26. Interrupt Mask Register
(FB_H: Read/Write)
R255 SPL
D7 D6 D5 D4 D3 D2 D1 D0
Stack Pointer Lower
Byte (SP0-SP7)
Figure 29. Stack Pointer
(FF_H: Read/Write)
R252 Flags
D7 D6 D5 D4 D3 D2 D1 D0
User Flag F1
User Flag F2
Half Carry Flag
Decimal Adjust Flag
Overflow Flag
Sign Flag
Zero Flag
Carry Flag
Figure 27. Flag Register
(FC_H: Read/Write)
R253 RP
D7 D6 D5 D4 D3 D2 D1 D0
Bank Pointer
r4
r5
Register
Pointer
r6
r7
Figure 28. Register Pointer
(FD_H: Read/Write)
20
PRELIMINARY
DS97KEY0102