Z89175 Datasheet, PDF (63/68 Pages) Zilog, Inc. – Voice Processing Controllers

Zilog
Z8^® CONTROL REGISTERS
R240
D7 D6 D5 D4 D3 D2 D1 D0
RESERVED
Figure 67. Reserved (F0H)
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 Modes
00 Not Used
01 T0 Out
10 T1 Out
11 Internal Clock Out (P36)
Figure 68. Timer Mode Register
(F1H: Read/Write)
R242 T1
D7 D6 D5 D4 D3 D2 D1 D0
T1 Low Byte Initial Value
(When Written)
T1 Low Byte Current Value
(When Read)
Figure 69. Counter/Timer 1 Register
(F2H: Read/Write)
Z89175/Z89176
Voice Processing Controllers
R243 PRE1
D7 D6 D5 D4 D3 D2 D1 D0
2
Count Mode
0 T1 Single Pass
1 T1 Modulo N
Clock Source
1 T1Internal
0 T1External Timing Input
(TIN) Mode
Prescaler Modulo
(Range: 1-64 Decimal
01-00 HEX)
Figure 70. Prescaler 1 Register
(F3H: Write-Only)
R244 T0
D7 D6 D5 D4 D3 D2 D1 D0
T0 Low Byte Initial Value
(When Written)
T0 Low Byte Current Value
(When Read)
Figure 71. Counter/Timer 0 Register
(F4H: Read/Write)
R243 PRE1
D7 D6 D5 D4 D3 D2 D1 D0
Count Mode
0 T1 Single Pass
1 T1 Modulo N
Clock Source
1 T1Internal
0 T1External Timing Input
(TIN) Mode
Prescaler Modulo
(Range: 1-64 Decimal
01-00 HEX)
Figure 72. Prescaler 0 Register
(F5H: Write-Only)
DS97TAD0100
PRELIMINARY
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