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Z86L997 Datasheet(PDF) 49 Page - Zilog, Inc.

Part # Z86L997
Description  Low-Voltage Micro controllers with ADC
PDF  102 Pages
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z86L997 Datasheet(HTML) 49 Page - Zilog, Inc.

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Z86D990/Z86D991 OTP and Z86L99X ROM
Low-Voltage Microcontrollers with ADC
PS003807-1002
P
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42
R241 TMR
Timer Mode Register
(F1h; Read/Write)
Figure 28. Timer Mode Register TIN Operation
R243 PRE1
Prescaler 1 Register
(F3h; Write Only)
Figure 29. Prescaler 1 TIN Operation
The T1 counter/timer clock source must be configured for external by setting
PRE1 bit D2 to 0. The Timer Mode register bits D5 and D4 can then be used to
select the TIN operation.
For T1 to start counting as a result of a TIN input, the Enable Count bit D3 in TMR
must be set to 1. When using TIN as an external clock or a gate input, the initial
values must be loaded into the down-counters by setting the Load bit D2 in TMR
to 1 before counting begins. Initial values are automatically loaded in Trigger and
Retrigger modes, so software loading is unnecessary.
Configure P52 as an input line by setting P5M bit D2 to 1.
D5
D4
TIN modes
External clock input = 00
Gate input = 01
Trigger input = 10
(non-retriggerable)
Trigger input = 11
(retriggerable)
D1
Clock source
1 = T1 internal
0 = T1 external (TIN)



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