z89136 ZiLOG Semiconductor, z89136 Datasheet - Page 58

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

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Z8 CONTROL REGISTERS (Continued)
Z89135/136 (ROMless)
Low-Cost DTAD Controller
1-58
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R246 P2M
R247 P3M
Default Setting After Reset
D7 D6 D5
D7 D6 D5 D4 D3 D2
Default Setting After Reset
Figure 70. Port 2 Mode Register
Figure 71. Port 3 Mode Register
D4 D3 D2 D1 D0
(F6H: Write Only)
(F7H: Write Only)
D1 D0
0 Port 2 Pull-Ups Open Drain
1 Port 2 Pull-Ups Active
0 P32 = Input
1 P32 = /DAV0/RDY0
0 P31 = Input (TIN)
1 P31 = /DAV2/RDY2
0 P30 = Input
Reserved
0 P31, P32 Digital Mode
1 P31, P32 Analog Mode
00 P33 = Input
01 P33 = Input
10 P33 = Input
11 P33 = /DAV1/RDY1
P20 - P27 I/O Definition
P35 = Output
P35 = RDY0//DAV0
P36 = Output (TOUT)
P36 = RDY2//DAV2
P37 = Output
0
1
P34 = Output
P34 = /DM
P34 = /DM
P34 = RDY1//DAV1
Defines Bit as Output
Defines Bit as Input
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P R E L I M I N A R Y
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R248 P01M
R249 IPR
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
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Default Setting After Reset
Figure 73. Interrupt Priority Register
Figure 72. Port 0 Mode Register
(F8H: Write Only)
(F9H: Write Only)
Interrupt Group Priority
IRQ1, IRQ4 Priority (Group C)
IRQ0, IRQ2 Priority (Group B)
IRQ3, IRQ5 Priority (Group A)
Reserved
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
0 IRQ1 > IRQ4
1 IRQ4 > IRQ1
0 IRQ2 > IRQ0
1 IRQ0 > IRQ2
0 IRQ5 > IRQ3
1 IRQ3 > IRQ5
P10 - P17 Mode
P00 - P03 Mode
Stack Selection
External Memory Timing
P04 - P07 Mode
00 Byte Output
01 Byte Input
10 AD7 - AD0
11 High-Impedance AD7 - AD0,
00 Output
01 Input
1X A11 - A8
0 External
1 Internal
0 Normal
1 Extended
00 Output
01 Input
1X A15 - A12
/AS, /DS, /R//W, A11 - A8,
A15 - A12, If Selected
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DS97TAD0300
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Zilog