Z89135 Datasheet, PDF (59/66 Pages) Zilog, Inc. – Low-Cost DTAD Controller

Zilog
R250 IRQ
D7 D6 D5 D4 D3 D2 D1 D0
IRQ0 = P32 Input
IRQ1 = P33 Input
IRQ2 = P31 Input
IRQ3 = DSP
IRQ4 = T0
IRQ5 = T1
Inter Edge
P31 ↓ P32 ↓ = 00
P31 ↓ P32 ↑ = 01
P31 ↑ P32 ↓ = 10
P31 ↑↓ P32 ↑↓ = 11
Figure 74. Interrupt Request Register
R251 IMR
D7 D6 D5 D4 D3 D2 D1 D0
1 Enables IRQ0-IRQ5
(D0 = IRQ0)
1 Enables RAM Protect
1 Enables Interrupts
Figure 75. Interrupt Mask Register
(FBH: 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 76. Flag Register
(FCH: Read/Write)
Z89135/136 (ROMless)
Low-Cost DTAD Controller
R253 RP
D7 D6 D5 D4 D3 D2 D1 D0
1
Expanded Register File Bank
Working Register Group
Figure 77. Register Pointer
(FDH: Read/Write)
R254 SPH
D7 D6 D5 D4 D3 D2 D1 D0
Stack Pointer Upper
Byte (SP8 - SP15)
Figure 78. Stack Pointer High
(FEH: Read/Write)
R255 SPL
D7 D6 D5 D4 D3 D2 D1 D0
Stack Pointer Lower
Byte (SP0 - SP7)
Figure 79. Stack Pointer Low
(FFH: Read/Write)
DS97TAD0300
PRELIMINARY
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