Z08617 Datasheet, PDF (16/26 Pages) Zilog, Inc. – NMOS Z8 8-BIT MCU KEYBOARD CONTROLLER

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
0 = No Function
1 = Load T1
0 = Disable T1 Count
1 = Enable T1 Count
TIN Modes
00 = External Clock Input
01 = Gate Input
10 = Trigger Input
(Non-retriggerable)
11 = Trigger Input
(Retriggerable)
TOUT Mode
00 = Not Used
01 = T0 OUT
10 = T1 OUT
11 = Internal Clock Out
Figure 18. Timer Mode Register
(F1H: Read/Write)
R242 T1
D7 D6 D5 D4 D3 D2 D1 D0
T1 Initial Value
(When WRITE)
(Range 1-256 Decimal
01-00 HEX)
T1 Current Value
(When READ)
Figure 19. Counter Timer 1 Register
(F2H: Read/Write)
Z08617 NMOS Z8^® 8-BIT MCU
KEYBOARD CONTROLLER
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)
Figure 21. Counter/Timer 0 Register
(F4H: Read/Write)
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)
Figure 22. Prescaler 0 Register
(F5H: Write Only)
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 23. Port 2 Mode Register
(F6H: Write Only)
R243 PRE1
D7 D6 D5 D4 D3 D2 D1 D0
Count Mode
0 = T1 Single Pass
1 = T1 Modulo N
Clock Source
1 = T0 Internal
0 = T0 External Timing Input
(TIN) Mode
Prescaler Modulo
(Range: 1-64 Decimal
01-00 HEX)
Figure 20. Prescaler 1 Register
(F3H: Write Only)
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)
Figure 24. Port 3 Mode Register
(F7H: Write Only)
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