Z86C04 Datasheet, PDF (29/34 Pages) Zilog, Inc. – CMOS 8-BIT LOW-COST 1K/2K-ROM MICROCONTROLLERS

Zilog
Z86C04/C08
CMOS 8-Bit Low-Cost 1K/2K-ROM Microcontrollers
R248 P01M
D7 D6 D5 D4 D3 D2 D1 D0
P0₀ - P0 ₃ Mode
00 = Output
01 = Input
Must be 1.
Reserved (Must be 0.)
R251 IMR
D7 D6 D5 D4 D3 D2 D1 D0
1
1 Enables IRQ5-IRQ0
(D = IRQ0)
0
Reserved (Must be 0.)
1 Enables Interrupts
Figure 24. Port 0 and 1 Mode Register
(F8_H: Write Only)
Figure 27. Interrupt Mask Register (FB_H: Read/Write)
R249 IPR
D7 D6 D5 D4 D3 D2 D1 D0
Interrupt Group Priority
000 Reserved
001 C > A > B
010 A > B > C
011 A > C > B
100 B > C > A
101 C > B > A
110 B > A > C
111 Reserved
IRQ1, IRQ4 Priority (Group C)
0 IRQ1 > IRQ4
1 IRQ4 > IRQ1
IRQ0, IRQ2 Priority (Group B)
0 IRQ2 > IRQ0
1 IRQ0 > IRQ2
IRQ3, IRQ5 Priority (Group A)
0 IRQ5 > IRQ3
1 IRQ3 > IRQ5
Reserved (Must be 0.)
Figure 25. Interrupt Priority Register (F9_H: Write Only)
R250 IRQ
D7 D6 D5 D4 D3 D2 D1 D0
IRQ0 = P32 Input ↓
IRQ1 = P33 Input ↓
IRQ2 = P31 Input ↓
IRQ3 = P32 Input ↑
IRQ4 = T0
IRQ5 = T1
Reserved (Must be 0.)
Figure 26. Interrupt Request Register (FA_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 28. Flag Register (FC_H: Read/Write)
R253 RP
D7 D6 D5 D4 D3 D2 D1 D0
Reserved (Must be 0.)
Register Pointer
Figure 29. Register Pointer (FD_H: Read/Write)
R255 SPL
D7 D6 D5 D4 D3 D2 D1 D0
Stack Pointer Lower
Byte (SP ₀ - SP ₇ )
Figure 30. Stack Pointer (FF_H: Read/Write)
DS97DZ80502
PRELIMINARY
29