HT68F20 datasheet(109/210 Pages) HOLTEK

109 / 210 page

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

Rev.1.00

109

November 3, 2009

In the Compare Match Output Mode, the T1AIO1 and T1AIO0 bits determine how the TM

output pin changes state when a compare match occurs from the Comparator A. The TM output

pin can be setup to switch high, switch low or to toggle its present state when a compare match

occurs from the Comparator A. When the bits are both zero, then no change will take place on

the output. The initial value of the TM output pin should be setup using the T1AOC bit in the

TM1C1 register. Note that the output level requested by the T1AIO1 and T1AIO0 bits must be

different from the initial value setup using the T1AOC bit otherwise no change will occur on the

TM output pin when a compare match occurs. After the TM output pin changes state it can be

reset to its initial level by changing the level of the T1ON bit from low to high.

Bit 3

T1AOC: TP1A Output control bit

Compare Match Output Mode

0: Initial low

1: Initial high

PWM Mode/ Single Pulse Output Mode

0: Active low

1: Active high

This is the output control bit for the TM output pin. Its operation depends upon whether TM is

being used in the Compare Match Output Mode or in the PWM Mode/ Single Pulse Output Mode.

It has no effect if the TM is in the Timer/Counter Mode. In the Compare Match Output Mode it

determines the logic level of the TM output pin before a compare match occurs. In the PWM

Mode it determines if the PWM signal is active high or active low.

Bit 2

T1APOL: TP1A Output polarity Control

0: Non-invert

1: Invert

This bit controls the polarity of the TP1A output pin. When the bit is set high the TM output pin

will be inverted and not inverted when the bit is zero. It has no effect if the TM is in the

Timer/Counter Mode.

Bit 1

T1CDN: TM1 Counter count up or down flag

0: Count up

1: Count down

Bit 0

T1CCLR: Select TM1 Counter clear condition

0: TM1 Comparator P match

1: TM1 Comparator A match

This bit is used to select the method which clears the counter. Remember that the Enhanced

TM contains two comparators, Comparator A and Comparator P, either of which can be selected

to clear the internal counter. With the T1CCLR bit set high, the counter will be cleared when a

compare match occurs from the Comparator A. When the bit is low, the counter will be cleared

when a compare match occurs from the Comparator P or with a counter overflow. A counter

overflow clearing method can only be implemented if the CCRP bits are all cleared to zero. The

T1CCLR bit is not used in the PWM, Single Pulse or Input Capture Mode.

HT68F20 Datasheet(PDF) 109 Page - Holtek Semiconductor Inc

HT68F20 Datasheet(HTML) 109 Page - Holtek Semiconductor Inc

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