HT66F03 datasheet(91/139 Pages) HOLTEK

91 / 139 page

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.00

April 16, 2010

Single Pulse Output Mode

To select this mode, the required bit pairs, TnAM1,

TnAM0 and TnBM1, TnBM0 should be set to 10 respec-

tively and also the corresponding TnAIO1, TnAIO0 and

TnBIO1, TnBIO0 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 TPnA output leading edge is a

low to high transition of the TnON bit, which can be im-

plemented using the application program. The trigger

for the pulse TPnB output leading edge is a compare

match from Comparator B, which can be implemented

using the application program. However in the Single

Pulse Mode, the TnON bit can also be made to automat-

ically change from low to high using the external TCKn

pin, which will in turn initiate the Single Pulse output of

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

counter will start running and the pulse leading edge of

TPnA will be generated. The TnON bit should remain

high when the pulse is in its active state. The generated

pulse trailing edge of TPnA and TPnB will be generated

when the TnON bit is cleared to zero, which can be im-

plemented using the application program or when a

compare match occurs from Comparator A.

However a compare match from Comparator A will also

automatically clear the TnON bit and thus generate the

Single Pulse output trailing edge of TPnA and TPnB. In

this way the CCRA value can be used to control the

pulse width of TPnA. The CCRA-CCRB value can be

used to control the pulse width of TPnB. A compare

match from Comparator A and Comparator B will also

generate TM interrupts. The counter can only be reset

back to zero when the TnON bit changes from low to

high when the counter restarts. In the Single Pulse

Mode CCRP is not used. The TnCCLR bit is also not

used.

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 P n A O u t p u t P i n

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

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

Single Pulse Generation

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