HT66F20 datasheet(109/250 Pages) HOLTEK

109 / 250 page

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Rev. 1.20

109

June 4, 2010

Single Pulse Mode

To select this mode, bits TnM1 and TnM0 in the TMnC1

TnIO1 and TnIO0 bits should be set to 11 respectively.

The Single Pulse Output Mode, as the name suggests,

will generate a single shot pulse on the TM output pin.

The trigger for the pulse output leading edge is a low to

high transition of the TnON bit, which can be imple-

mented using the application program. However in the

Single Pulse Mode, the TnON bit can also be made to

automatically change from low to high using the external

TCKn pin, which will in turn initiate the Single Pulse out-

put. When the TnON bit transitions to a high level, the

counter will start running and the pulse leading edge will

be generated. The TnON bit should remain high when

the pulse is in its active state. The generated pulse trail-

ing edge will be generated when the TnON bit is cleared

to zero, which can be implemented using the application

program or when a compare match occurs from Com-

parator A.

L e a d i n g E d g e

T n O N b i t

0 ® 1

S / W C o m m a n d

S E T " T n O N "

o r

T C K n P i n T r a n s i t i o n

T n O N b i t

1 ® 0

S / W C o m m a n d

C L R " T n O N "

o r

C C R A M a t c h C o m p a r e

P u l s e W i d t h = C C R A V a l u e

T r a i l i n g E d g e

T M n O u t p u t P i n

Single Pulse Generation

Single Pulse Mode

Note:

1. Counter stopped by CCRA match

2. CCRP is not used

3. Pulse triggered by TCKn pin or setting TnON bit high

4. TCKn pin active edge will auto set TnON bit

HT66F20 Datasheet(PDF) 109 Page - Holtek Semiconductor Inc

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