HT68F03 datasheet(79/147 Pages) HOLTEK

79 / 147 page

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.30

February 17, 2011

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

Counter Value

CCRP

CCRA

TnON

TnPAU

TnPOL

CCRP Int.

Flag TnPF

CCRA Int.

Flag TnAF

TM O/P Pin

(TnOC=1)

Time

Counter stopped

by CCRA

Pause

Resume

Counter Stops

by software

Counter Reset when

TnON returns high

TnM [1:0] = 10 ; TnIO [1:0] = 11

Pulse Width

set by CCRA

Output Inverts

when TnPOL = 1

No CCRP Interrupts

generated

TM O/P Pin

(TnOC=0)

TCKn pin

Software

Trigger

Cleared by

CCRA match

TCKn pin

Trigger

Auto. set by

TCKn pin

Software

Trigger

Software

Clear

Software

Trigger

Software

Trigger

Single Pulse Mode

Note:

1. Counter stopped by CCRA

2. CCRP is not used

3. The pulse triggered by the TCKn pin or by setting the TnON bit high

4. A TCKn pin active edge will automatically set the TnON bit high.

5. In the Single Pulse Mode, TnIO [1:0] must be set to

²11² and can not be changed.

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