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UPD17708 Datasheet(PDF) 178 Page - NEC

Part # UPD17708
Description  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17708 Datasheet(HTML) 178 Page - NEC

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13.4.5 Error of timer 1
Timer 1 has an error of up to 1 basic clock in the following cases.
(1) On starting/stopping counter
The counter is started or stopped by setting the TM1EN flag.
Therefore, an error of 0 to +1 clocks occurs when the TM1EN flag is set, and an error of –1 to 0 clocks
occurs when the flag is reset.
In all, an error of
±1 count occurs.
(2) On resetting counter operation
An error of 0 to +1 clocks occurs when the counter is reset.
(3) On selecting basic clock during counter operation
An error of 0 to +1 clocks of the newly selected clock occurs.
13.4.6 Cautions on using timer 1
Timer 1 interrupt may occur simultaneously with the other timer interrupts and CE reset. If it is necessary
to update the timer at CE reset, do not use timer 1, use basic timer 0 instead.



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