HT68F20 datasheet(91/210 Pages) HOLTEK

91 / 210 page

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

Rev.1.00

November 3, 2009

Standard Type TM - STM

The Standard Type TM contains five operating modes, which are Compare Match Output, Timer/Event Counter, Cap-

ture Input, Single Pulse Output and PWM Output modes. The Standard TM can also be controlled with an external in-

put pin and can drive one or two external output pins.

CTM

Name

TM No.

TM Input Pin

TM Output Pin

HT68F20

10-bit STM

TCK1

TP1_0, TP1_1

HT68F30

¾¾¾¾

HT68F40

16-bit STM

TCK2

TP2_0, TP2_1

HT68F50

16-bit STM

TCK2

TP2_0, TP2_1

HT68F60

16-bit STM

TCK2

TP2_0, TP2_1

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 7 ~ b 9 o r b 8 ~ b 1 5

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

1 0 o r 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 0 o 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

T P n P i n

I n p u t / O u t p u t

b 0 ~ b 9 o r

b 0 ~ b 1 5

E d g e

D e t e c t o r

T n I O 1 , T n I O 0

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 _ 0

T P n _ 1

T C K 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

R e s e r v e d

Standard Type TM Block Diagram

Standard TM Operation

There are two sizes of Standard TMs, one is 10-bits

wide and the other is 16-bits wide. At the core is a 10 or

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, Com-

parator A and Comparator P. These comparators will

compare the value in the counter with CCRP and CCRA

registers. The CCRP comparator is 3 or 8-bits wide

whose value is compared the with highest 3 or 8 bits in

the counter while the CCRA is the ten or sixteen bits and

therefore compares all counter bits.

The only way of changing the value of the 10 or 16-bit

counter using the application program, is to clear the

counter by changing 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 inter-

rupt signal will also usually be generated. The Standard

Type TM can operate in a number of different opera-

tional 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 using rele-

vant internal registers.

Standard Type TM Register Description

Overall operation of the Standard TM is controlled using

a series of registers. A read only register pair exists to

store the internal counter 10 or 16-bit value, while a

read/write register pair exists to store the internal 10 or

16-bit CCRA value. The remaining two registers are

control registers which setup the different operating and

control modes as well as the three or eight CCRP bits.

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