Z86C61 Datasheet, PDF (36/46 Pages) Zilog, Inc. – CMOS Z8 MICROCONTROLLER

Z8 CONTROL REGISTER DIAGRAMS (Continued)
Z86C61/62/96
Z8^® MICROCONTROLLER
R250 IRQ
D7 D6 D5 D4 D3 D2 D1 D0
R253 RP
D7 D6 D5 D4 D3 D2 D1 D0
IRQ0 = P32 Input (D0 = IRQ0)
IRQ1 = P33 Input
IRQ2 = P31 Input
IRQ3 = P30 Input, Serial Input
IRQ4 = T0 Serial Output
IRQ5 = T1
Reserved (Must be 0)
Expanded Register Pointer
Working Register Pointer
Figure 43. Register Pointer Register
(FD_H: Read/Write)
Figure 40. Interrupt Request Register
(FA_H: Read/Write)
R254 SPH
D7 D6 D5 D4 D3 D2 D1 D0
R251 IMR
D7 D6 D5 D4 D3 D2 D1 D0
1 Enables IRQ5-IRQ0
(D0 = IRQ0)
1 Enables RAM Protect
1 Enables Interrupts
Figure 41. Interrupt Mask Register
(FB_H: Read/Write)
Stack Pointer Upper
Byte (SP15 - SP8)
Figure 44. Stack Pointer Register
(FE_H: Read/Write)
R255 SPL
D7 D6 D5 D4 D3 D2 D1 D0
Stack Pointer Lower
Byte (SP7 - SP0)
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 45. Stack Pointer Register
(FF_H: Read/Write)
Figure 42. Flag Register
(FC_H: Read/Write)
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