z08617 ZiLOG Semiconductor, z08617 Datasheet - Page 17

• Manufacturer Part Number: z08617
• Description: Nmos Z8 8-bit Mcu Keyboard Controller
• Manufacturer: ZiLOG Semiconductor

Z8
R248 P01M
R249 IPR
D7 D6
D7 D6 D5 D4 D3 D2 D1
®
CONTROL REGISTER DIAGRAMS (Continued)
Figure 25. Port 0 and 1 Mode Register
D5 D4 D3 D2
Figure 26. Interrupt Priority Register
(F8H: Write Only)
(F9H: Write Only)
D1
D0
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
Interrupt Group Priority
IRQ1, IRQ4 Priority (Group C)
IRQ0, IRQ2 Priority (Group B)
IRQ3, IRQ5 Priority (Group A)
Reserved (Must be 0)
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
0 = IRQ1 > IRQ4
1 = IRQ4 > IRQ1
0 = IRQ2 > IRQ0
1 = IRQ0 > IRQ2
0 = IRQ5 > IRQ3
1 = IRQ3 > IRQ5
R250 IRQ
R251 IMR
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
Figure 27. Interrupt Request Register
Figure 28. Interrupt Mask Register
(FBH: Read/Write)
(FAH: Read/Write)
Reserved (Must be 0)
1 Enables IRQ0-IRQ5
(D0 = IRQ0)
1 Enables Interrupts
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.
Z08617 NMOS Z8
K
EYBOARD
®
C
ONTROLLER
8-B
IT
MCU
17