UPD17708 datasheet(156/356 Pages) NEC

Teilenummer	UPD17708

Bauteilbeschribung	4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM

PDF	356 Pages

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Hersteller	NEC [NEC]

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156 / 356 page

µPD17704, 17705, 17707, 17708, 17709

156

Therefore, as shown in Figure 13-7, the error of the time until the BTM0CY flag is first set after the

BTM0CY flag setting time has been changed is as follows:

–tSET < Error < tCHECK

tSET

: new setting time of BTM0CY flag

tCHECK : time to detect BTM0CY flag

Phase differences are provided among the internal pules of 10, 20, 50, and 100 Hz. Because these phase

differences are shorter than the newly set pulse time, they are included in the above error.

Figure 13-7. Timer Error When BTM0CY Flag Setting Time Is Changed from A to B

tSET

SKT1 BTM0CY

Intrinsic timer time

Actual timer time

Time changed

Internal pulse A

Internal pulse B

BTM0CY flag

setting pulse

BTM0CY flag

tSET

tCHECK

Actual timer time

Intrinsic timer time

Time changed

An error of tCHECK occurs if the timer time is

changed immediately after BTM0CY flag

has been detected because the flag is then

reset once.

An error of -tSET occurs if BTM0CY flag is

detected immediately after the timer time

has been changed because the flag then

becomes “1”.

UPD17708 Datenblatt(PDF) 156 Page - NEC