z89136 ZiLOG Semiconductor, z89136 Datasheet - Page 59

• Manufacturer Part Number: z89136
• Description: Low-cost Dtad Controller
• Manufacturer: ZiLOG Semiconductor

Zilog
DS97TAD0300
R251 IMR
R252 FLAGS
R250 IRQ
D7
D7
D7
D6 D5 D4 D3 D2 D1
D6 D5 D4 D3 D2
D6 D5 D4 D3 D2
Figure 74. Interrupt Request Register
Figure 75. Interrupt Mask Register
Figure 76. Flag Register
(FBH: Read/Write)
(FCH: Read/Write)
D1 D0
D1 D0
D0
1 Enables IRQ0-IRQ5
1 Enables RAM Protect
1 Enables Interrupts
User Flag F1
User Flag F2
Half Carry Flag
Decimal Adjust Flag
Overflow Flag
Sign Flag
Zero Flag
Carry Flag
IRQ0 = P32 Input
IRQ1 = P33 Input
IRQ2 = P31 Input
IRQ3 = DSP
IRQ4 = T0
IRQ5 = T1
Inter Edge
(D0 = IRQ0)
P31
P31
P31
P31
P32
P32
P32
P32
P R E L I M I N A R Y
= 00
= 01
= 10
= 11
R255 SPL
R253 RP
R254 SPH
D7 D6
D7 D6 D5
D7 D6 D5
D5 D4 D3 D2
D4 D3 D2 D1
D4 D3 D2 D1
Figure 78. Stack Pointer High
Figure 79. Stack Pointer Low
Figure 77. Register Pointer
(FDH: Read/Write)
(FEH: Read/Write)
(FFH: Read/Write)
D1 D0
D0
D0
Low-Cost DTAD Controller
Z89135/136 (ROMless)
Stack Pointer Lower
Byte (SP0 - SP7)
Expanded Register File Bank
Working Register Group
Stack Pointer Upper
Byte (SP8 - SP15)
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