HT66F40 datasheet(90/244 Pages) HOLTEK

90 / 244 page

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

HT68FU30/HT68FU40/HT68FU50/HT68FU60

Rev. 1.60

October 24, 2011

· Reading Data from the Counter Registers and CCRB or CCRA

¨ Step 1. Read data from the High Byte TMxDH, TMxAH or TMxBH

- here data is read directly from the High Byte registers and simultaneously data is latched from the Low Byte

¨ Step 2. Read data from the Low Byte TMxDL, TMxAL or TMxBL

- this step reads data from the 8-bit buffer.

Compact Type TM

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 or two external output pins. These two external output pins can be the same sig-

nal or the inverse signal.

CTM

Name

TM No.

TM Input Pin

TM Output Pin

HT68F20

10-bit CTM

TCK0

TP0_0

HT68F30

10-bit CTM

TCK0

TP0_0, TP0_1

HT68F40

10-bit CTM

TCK0

TP0_0, TP0_1

HT68F50

10-bit CTM

0, 3

TCK0, TCK3

TP0_0, TP0_1; TP3_0, TP3_1

HT68F60

10-bit CTM

0, 3

TCK0, TCK3

TP0_0, TP0_1; TP3_0, TP3_1

Compact TM Operation

At its core is a 10-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 three bits wide whose value is compared with the

highest three bits in the counter while the CCRA is the ten bits and therefore compares with all counter bits.

The only way of changing the value of the 10-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 7 ~ b 9

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

T C K n

1 0 - 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 - 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

O u t p u t

b 0 ~ b 9

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

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

Compact Type TM Block Diagram

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