Z86E61 Datasheet, PDF (32/44 Pages) Zilog, Inc. – CMOS Z8 16K/32K EPROM MICROCONTROLLER

PRELIMINARY
Z8 CONTROL REGISTER DIAGRAMS (Continued)
Z86E61/E63 Z8^® MCU
WITH 16K/32K EPROM
R246 P2M
D7 D6 D5 D4 D3 D2 D1 D0
P20 - P27 I/O Definition
0 Defines Bit as Output
1 Defines Bit as Input
Figure 34. Port 2 Mode Register
(F6 : Write Only)
H
R247 P3M
D7 D6 D5 D4 D3 D2 D1 D0
0 Port 2 Pull-Ups Open Drain
1 Port 2 Pull-Ups Active
Reserved (Must be 0)
0 P32 = Input
P35 = Output
1 P32 = /DAV0/RDY0
P35 = RDY0//DAV0
00 P33 = Input
P34 = Output
01 P33 = Input
10 P34 = /DM
11 P33 = /DAV1/RDY1
P34 = RDY1//DAV1
0 P31 = Input (TIN)
P36 = Output (TOUT)
1 P31 = /DAV2/RDY2
P36 = RDY2//DAV2
0 P30 = Input
P37 = Output
1 P30 = Serial In
P37 = Serial Out
0 Parity Off
1 Parity On
Figure 35. Port 3 Mode Register
(F7_H: Write Only)
R248 P01M
D7 D6 D5 D4 D3 D2 D1 D0
P00 - P00 Mode
00 Output
01 Input
1X A11 - A8
Stack Selection
0 External
1 Internal
P17 - P10 Mode
00 Byte Output
01 Byte Input
10 AD7 - AD0
11 High-Impedance AD7 - DA0,
/AS, /DS, /R//W, A11 - A8,
A15 - A12, If Selected
Reserved (Must be 0)
P07 - P04 Mode
00 Output
01 Input
1X A 15 - A12
Figure 36. Port 0 and 1 Mode Register
(F8 : Write Only)
H
R249 IPR
D7 D6 D5 D4 D3 D2 D1 D0
Interrupt Group Priority
Reserved = 000
C > A > B = 001
A > B > C = 010
A > C > B = 011
B > C > A = 100
C > B > A = 101
B > A > C = 110
Reserved = 111
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 37. Interrupt Priority Register
(F9_H: Write Only)
32