Holtek HT66F20 Manual page 148

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.
T1CDN: TM1 Counter count up or down flag
Bit 1
0: Count up
1: Count down
T1CCLR: Select TM1 Counter clear condition
Bit 0
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 three comparators, Comparator A, Comparator B and
Comparator P, but only Comparator A or Comparator Pan 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 Single Pulse or Input
Capture Mode.
Rev. 2.50
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
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