HT68F20 datasheet(104/210 Pages) HOLTEK

104 / 210 page

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

Rev.1.00

104

November 3, 2009

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

CCRA

CCRP

Counter

Value

Counter Stopped

by CCRA

CCRP Int.

Flag TnPF

CCRA Int.

Flag TnAF

TM Pin

TnOC = 1

TnON bit

Pulse Width

set by CCRA

TnIO1, TnIO 0 = 11 Single Pulse Output

TnIO 1, TnIO0 = 00

Output Inact ive

TnIO1, TnI O0 = 11

No CCRP

Interrupt

generated

Here TnIO 1, TnIO0 = 00

Output Forced to Inactive

level but counter keeps

running internally

TnIO 1, TnIO0 = 11

Resume Single Pulse O utput

Counter Stops

by soft ware

Count er reset

when TnON

returns high

Time

TnPOL bit

Out put Inverts

When TnPOL = 1

TM Pin

TnOC = 0

TnPAU bit

Resume

Pause

Sof tware

Trigger

TCKn pin

Cleared by

CCRA match

TCKn pin

Trigger

Auto. s et

by TCKn pin

Soft ware

Clear

Software

Trigger

Software

Trigger

TnM1, TnM0 = 10; TnIO1, TnIO0 = 11

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

HT68F20 데이터시트(PDF) 104 Page - Holtek Semiconductor Inc

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