Z86L79 Datasheet, PDF (55/58 Pages) Zilog, Inc. – Low-Voltage Microcontroller

Zilog
Z86L79/80
Low-Voltage Microcontroller
Z8^® STANDARD CONTROL REGISTER DIAGRAMS
R247 P3M
R249 IPR
1
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
† Effects P34 and P35 as well
* Default setting after reset
** Output status controlled by P3M, D0
0 Port 2 Open-Drain*†
1 Port 2 Push-pull
0 Digital
1 Analog
0 P32 = Input*
P35 = Output**
1 P32 = /DAV0/RDY0
P35 = RDY0//DAV0
Reserved (Must be 0)
Figure 47. Port 3 Mode Register
(F7H; Write Only)
Interrupt Group Priority
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
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)
R248 P01M
D7 D6 D5 D4 D3 D2 D1 D0
* Default Setting After Reset.
P00-P03 Mode
00 Output
01 Input*
1X A11-A8
Reserved (Must be 1)
Reserved (Must be 0)
P07-P04 Mode
00 Output
01 Input*
1X A15-A12
Figure 49. Interrupt Priority Registers
((0) F9H: Write Only
R250 IRQ
D7 D6 D5 D4 D3 D2 D1 D0
IRQ0 = P32 Input
IRQ1 = P33 Input
IRQ2 = P31 Input
IRQ3 = Software Controlled
IRQ4 = T0 (L03 Software only)
IRQ5 = T1
Inter Edge
00 P31 ↓ P32 ↓
01 P31 ↓ P32 ↑
10 P31 ↑ P32 ↓
11 P31 ↑↓ P32 ↑↓
Figure 48. Port 0 and 1 Mode Register
(F8H: Write Only)
Figure 50. Interrupt Request Register
((0) FAH: Read/Write)
PRELIMINARY
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