z08617 ZiLOG Semiconductor, z08617 Datasheet - Page 16

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

16
Z8
R242 T1
R243 PRE1
R241 TMR
D7 D6 D5 D4 D3 D2 D1
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
®
CONTROL REGISTER DIAGRAMS
Figure 19. Counter Timer 1 Register
Figure 20. Prescaler 1 Register
Figure 18. Timer Mode Register
(F1H: Read/Write)
(F2H: Read/Write)
(F3H: Write Only)
D0
0 = No Function
1 = Load T1
TIN Modes
00 = External Clock Input
01 = Gate Input
10 = Trigger Input
(Non-retriggerable)
11 = Trigger Input
(Retriggerable)
T1 Initial Value
(When WRITE)
(Range 1-256 Decimal
01-00 HEX)
T1 Current Value
(When READ)
Count Mode
0 = No Function
1 = Load T0
0 = Disable T0 Count
1 = Enable T0 Count
0 = Disable T1 Count
1 = Enable T1 Count
TOUT Mode
00 = Not Used
01 = T0 OUT
10 = T1 OUT
11 = Internal Clock Out
Clock Source
Prescaler Modulo
(Range: 1-64 Decimal
01-00 HEX)
0 = T1 Single Pass
1 = T1 Modulo N
1 = T0 Internal
0 = T0 External Timing Input
(TIN) Mode
R245 PRE0
R244 T0
R247 P3M
R246 P2M
D7 D6
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
D5 D4 D3 D2 D1 D0
Figure 21. Counter/Timer 0 Register
Figure 23. Port 2 Mode Register
Figure 24. Port 3 Mode Register
Figure 22. Prescaler 0 Register
(F4H: Read/Write)
(F5H: Write Only)
(F6H: Write Only)
(F7H: Write Only)
0 Port 2 Pull-Ups Open-Drain
1 Port 2 Pull-Ups Active
Reserved (Must be 0)
Count Mode
Reserved (Must be 0)
Prescaler Modulo
(Range: 1-64 Decimal
01-00 HEX)
T0 Initial Value
(When WRITE)
(Range: 1-256 Decimal
01-00 HEX)
T0 Current Value
(When READ)
0 = T0 Single Pass
1 = T0 Modulo N
P20-P27 I/O Definition
0 Defines Bit as OUTPUT
1 Defines Bit as INPUT
Z08617 NMOS Z8
K
EYBOARD
®
C
8-B
ONTROLLER
IT
MCU