HT68F016 datasheet(53/116 Pages) HOLTEK

53 / 116 page

HT66F016/HT66F017/HT68F016/HT68F017

Rev. 1.00

May 14, 2012

Compact Type TM

- CTM

Although the simplest form of the three TM types, the Compact TM type still contains three operating modes, which are

Compare Match Output, Timer/Event Counter and PWM Output modes. The Compact TM can also be controlled with

an external input pin and can drive one external output pin.

CTM

Name

TM No.

TM Input Pin

TM Output Pin

HT66F017

HT68F017

16-bit CTM

TCK0

TP0

Compact TM Operation

At its core is a 16-bit count-up counter which is driven by a user selectable internal or external clock source. There are

also two internal comparators with the names, Comparator A and Comparator P. These comparators will compare the

value in the counter with CCRP and CCRA registers. The CCRP is 8-bit wide whose value is compared with the highest

eight bits in the counter while the CCRA is 16-bit wide and therefore compares with all counter bits.

The only way of changing the value of the 16-bit counter using the application program, is to clear the counter by chang-

ing the TnON bit from low to high. The counter will also be cleared automatically by a counter overflow or a compare

match with one of its associated comparators. When these conditions occur, a TM interrupt signal will also usually be

generated. The Compact Type TM can operate in a number of different operational modes, can be driven by different

clock sources including an input pin and can also control an output pin. All operating setup conditions are selected us-

ing relevant internal registers.

C C R P

C C R A

T n C C L R

C o m p a r a t o r P M a t c h

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

T n C K 2 ~ T n C K 0

T n O N

T n P A U

b 8 ~ b 1 5

8 - b i t C o m p a r a t o r P

T C K n

1 6 - b i t C o m p a r a t o r A

C o u n t e r C l e a r

1 6 - b i t C o u n t - u p C o u n t e r

T n P F I n t e r r u p t

T n A F I n t e r r u p t

b 0 ~ b 1 5

T n M 1 , T n M 0

T n I O 1 , T n I O 0

T n P O L

T n O C

P o l a r i t y

C o n t r o l

O u t p u t

C o n t r o l

T P n

1 1 1

0 0 0

0 0 1

0 1 0

0 1 1

1 0 0

1 0 1

1 1 0

f S Y S / 4

f S Y S

f H / 1 6

f H / 6 4

f T B C

f H / 8

Compact Type TM Block Diagram

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