Z86K13 Datasheet, PDF (19/24 Pages) Zilog, Inc. – CMOS Z8 8-Bit MCU Keyboard Controllers

Zilog
Z8^® CONTROL REGISTER DIAGRAMS
R241 TMR
D7 D6 D5 D4 D3 D2 D1 D0
0 = No Function
1 = Load T0
0 = Disable T0 Count
1 = Enable T0 Count
Reserved (Must be 0)
Figure 21. Timer Mode Register
(F1_H: Read/Write)
Z86K13/K14/K15/K16/K17/K18
CMOS Z8® 8-Bit MCU Keyboard Controllers
R246 P2M
1
D7 D6 D5 D4 D3 D2 D1 D0
Reserved
P24-P27 I/O Definition
0 Defines Bit as OUTPUT
1 Defines Bit as INPUT
Port 2 Mode Register
Figure 24. (F6_H: Write Only)
R244 T0
D7 D6 D5 D4 D3 D2 D1 D0
T0 Initial Value
(When WRITE)
(Range: 1-256 Decimal
01-00 HEX)
T0 Current Value
(When READ)
Counter/Timer 0 Register
Figure 22. (F4_H: Read/Write)
R247 P3M
D7 D6 D5 D4 D3 D2 D1 D0
0 Port (24-27) Open-Drain
1 Port (24-27) Push-Pull
Reserved (Must be 0)
Port 2 Open Drain Mode Register
Figure 25. (F7_H: Write Only)
R245 PRE0
D7 D6 D5 D4 D3 D2 D1 D0
Count Mode
0 = T0 Single Pass
1 = T0 Modulo N
Reserved (Must be 0)
Prescaler Modulo
(Range: 1-64 Decimal
01-00 HEX)
Prescaler 0 Register
Figure 23. (F5_H: 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
Reserved
Reserved (Must be 0)
Figure 26. Interrupt Priority Register
(F9_H: Write Only)
DS97KEY0204
PRELIMINARY
19