Rev. 1.71
92
April 11, 2017
Rev. 1.71
93
April 11, 2017
HT66F002/HT66F0025/HT66F003/HT66F004
Cost-Effective A/D Flash MCU with EEPROM
HT66F002/HT66F0025/HT66F003/HT66F004
Cost-Effective A/D Flash MCU with EEPROM
Single Pulse Output Mode
To select this mode, the required bit pairs, PTnM1 and PTnM0 should be set to 10 respectively and
also the corresponding PTnIO1 and PTnIO0 bits should be set to 11 respectively. The Single Pulse
Output Mode, as the name suggests, will generate a single shot pulse on the TM output pin.
The trigger for the pulse output leading edge is a low to high transition of the PTnON bit, which
can be implemented using the application program. However in the Single Pulse Mode, the PTnON
bit can also be made to automatically change from low to high using the external PTCKn pin,
which will in turn initiate the Single Pulse output. When the PTnON bit transitions to a high level,
the counter will start running and the pulse leading edge will be generated. The PTnON bit should
remain high when the pulse is in its active state. The generated pulse trailing edge will be generated
when the PTnON bit is cleared to zero, which can be implemented using the application program or
when a compare match occurs from Comparator A.
However a compare match from Comparator A will also automatically clear the PTnON bit and thus
generate the Single Pulse output trailing edge. In this way the CCRA value can be used to control
the pulse width. A compare match from Comparator A will also generate TM interrupts. The counter
can only be reset back to zero when the PTnON bit changes from low to high when the counter
restarts. In the Single Pulse Mode CCRP is not used. The PTnCCLR bit is also not used.
PTnON bit
0
�
1
S/W Command
SET
“
PTnON
”
or
PTCKn Pin
Transition
PTnON bit
1
�
0
Trailing Edge
S/W Command
CLR
“
PTnON
”
or
CCRA Compare
Match
PTPn/PTPnB
Output Pin
Pulse Width = CCRA Value
Leading Edge
Single Pulse Generation (n=0 or 1)