Z08617 Datasheet, PDF (17/26 Pages) Zilog, Inc. – NMOS Z8 8-BIT MCU KEYBOARD CONTROLLER

Z8^® CONTROL REGISTER DIAGRAMS (Continued)
Z08617 NMOS Z8^® 8-BIT MCU
KEYBOARD CONTROLLER
R248 P01M
D7 D6 D5 D4 D3 D2 D1 D0
P00 - P03 Mode
00 = Output
01 = Input
Stack Selection
1 = Internal (Must be 1)
P10-P17 Mode
0 = Byte Output
1 = Byte Input
Reserved (Must be 0)
P04 - P07 Mode
00 = Output
01 = Input
Figure 25. Port 0 and 1 Mode Register
(F8H: Write Only)
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 26. Interrupt Priority Register
(F9H: Write Only)
R250 IRQ
D7 D6 D5 D4 D3 D2 D1 D0
IRQ0 = P32 Input (D0 = IRQ0)
IRQ1 = P33 Input
IRQ2 = P31 Input
IRQ3 = P30 Input
IRQ4 = T0
IRQ5 = T1
Reserved (Must be 0)
WDT Hot Bit
0 = POR*
1 = WDT TIME OUT
*Default setting after setup.
Figure 27. Interrupt Request Register
(FAH: Read/Write)
R251 IMR
D7 D6 D5 D4 D3 D2 D1 D0
1 Enables IRQ0-IRQ5
(D0 = IRQ0)
Reserved (Must be 0)
1 Enables Interrupts
Figure 28. Interrupt Mask Register
(FBH: Read/Write)
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