z90102 ZiLOG Semiconductor, z90102 Datasheet - Page 32

• Manufacturer Part Number: z90102
• Description: 40-pin Low-cost Digital Television Controller
• Manufacturer: ZiLOG Semiconductor

Z8 REGISTER DIAGRAMS (Continued)
Z90102/90103/90104
40-Pin Low-Cost Digital Television Controller
32
R246 P2M
R245 PRE0
R244 T0
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
* Default After Reset
Figure 57. Counter/Timer 0 Register
Figure 59. Port 2 Mode Register
Figure 58. Prescaler 0 Register
(F4H: Read/Write)
(F5H: Write Only)
(F6H: Write Only)
F6H
F5H
F4H
P27 - P20 I/O Definition
T0 Initial Value
(When Written)
(Range: 1-256 Decimal
01-00 Hex)
T0 Current Value
(When Read)
Count Mode
Reserved (Must be 0)
Prescaler Modulo
0 Defines Bit as Output
1 Defines Bit as Input
(Range: 1-64 Decimal
0 T0 Single Pass*
1 T0 Modulo-N
01-00 Hex)
R247 P3M
R249 IPR
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
Figure 61. Interrupt Priority Register
Figure 60. Port 3 Mode Register
(F6H; Write Only)
(F9H: Write Only)
F7H
F9H
0 - Port 2 Open-Drain
1 - Port 2 Push-Pull
Reserved (Must be 0)
0 P32 - Input
(Must be 0)
00 P33 - Input
(Must be 0)
11 Reserved
0 P31 - Input (TIN)
0 P30 - Input
Reserved (Must be 0)
Reserved (Must be 0)
Interrupt Group Priority
IRQ1, IRQ4 Priority (Group C)
IRQ1, IRQ2 Priority (Group B)
IRQ3, IRQ5 Priority (Group A)
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
P35 - Output
P34 - Output
P36 - Output (TOUT)
DS97TEL1902
Zilog