Z86D99 ZILOG [Zilog, Inc.], Z86D99 Datasheet - Page 79
Z86D99
Manufacturer Part Number
Z86D99
Description
Low-Voltage Micro controllers with ADC
Manufacturer
ZILOG [Zilog, Inc.]
Datasheet
1.Z86D99.pdf
(102 pages)
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PS003807-1002
Bit
Bit/Field
R/W
Reset
R = Read, W = Write, X = Indeterminate
Bit
Position
76543210
Bit
Bit/Field
R/W
Reset
R = Read, W = Write, X = Indeterminate
Bit
Position
76______
__54____
____3___
T1 Data Register (T1)
The counter/timer register (T1) consists of an 8-bit down counter, a write-only reg-
ister that holds the initial count value, and a read-only register that holds the cur-
rent count value. The initial value of T1 can range from 1 to 255 (0 represents
256) (see Table 34.)
Table 34. T1 Register [Group/Bank F0h, Register 2 (R242)]
T1 Mode Register (TMR)
Under software control, T1 counter/timer is started and stopped using the T1
Mode Register as shown in Table 35.
Table 35. TMR Register [Group/Bank F0h, Register 1 (R241)]
7
T1_Value
R/W
0
Bit/Field
T
7
TOUT_Mode
R/W
0
Bit/Field
T
T
T
OUT
1
IN
1
Count
Value
Mode
Mode
P
6
R/W
0
6
R/W
0
R
E
L
5
R/W
0
R/W
R
W
5
TIN_Mode
R/W
0
R/W
R/W
R/W
R/W
I
M
Z86D990/Z86D991 OTP and Z86L99X ROM
4
R/W
0
Value
Data
Data
4
R/W
0
Value
11
10
01
00
11
10
01
00
1
0
I
Low-Voltage Microcontrollers with ADC
N
A
3
R/W
0
Description
Current Value
Initial Value (Range 1 to 256 Decimal)
3
T1_
Count
R/W
0
Description
Internal Clock OUT on P56
T
Reserved
Not used (P56 configured as I/O)
Trigger Input (Retriggerable)
Trigger Input (Not-retriggerable)
Gate Input
External Clock Input (T
Enable T
Disable T
1
R
OUT on P56
Y
1
2
R/W
0
2
T1_
Load
R/W
0
1
Count
Count
1
R/W
0
1
Reserved
R/W
1
IN
on P52)
0
R/W
0
0
R/W
1
72
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