HT66F24D View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT66F24D' PDF : 177 Pages View PDF
A/D Flash Type 8-bit MCU with EEPROM
HT66F24D/HT66F25D
TM External Pins
Each of the TMs, irrespective of what type, has one TM input pin, with the label TCKn. The TM
input pin, is essentially a clock source for the TM and is selected using the TnCK2~TnCK0 bits in
the TMnC0 register. This external TM input pin allows an external clock source to drive the internal
TM. This external TM input pin is shared with other functions but will be connected to the internal
TM if selected using the TnCK2~TnCK0 bits. The TM input pin can be chosen to have either a
rising or falling active edge.
The TMs each have one or more output pins with the label TPn. When the TM is in the Compare
Match Output Mode, these pins can be controlled by the TM to switch to a high or low level or to
toggle when a compare match situation occurs. The external TPn output pin is also the pin where
the TM generates the PWM output waveform. As the TM output pins are pin-shared with other
function, the TM output function must first be setup using registers. A single bit in one of the
registers determines if its associated pin is to be used as an external TM output pin or if it is to have
another function. The number of output pins for each TM type and device is different, the details are
provided in the accompanying table. All TM output pin names have a “_n” suffix. Pin names that
include a “_1” or “_2” suffix indicate that they are from a TM with multiple output pins. This allows
the TM to generate a complimentary output pair, selected using the I/O register data bits.
Device
CTM
STM
HT66F24D TP0_0, TP0_1, TP0_2 TP1_0, TP1_1, TP1_2
HT66F25D TP0_0, TP0_1, TP0_2
—
ETM
—
TP1A_0, TP1A_1
TP1B_0, TP1B_1,
TP1B_2
Register
TMPC0
TMPC0
TM Output Pins
TM Input/Output Pin Control Registers
Selecting to have a TM input/output or whether to retain its other shared function is implemented
using one register, with a single bit in each register corresponding to a TM input/output pin. Setting
the bit high will setup the corresponding pin as a TM input/output, if reset to zero the pin will retain
its original other function.
TMPC0 Register
Device
HT66F24D
HT66F25D
7
—
T1ACP1
Bit
6
5
4
3
2
—
T1CP2 T1CP1 T1CP0 T0CP2
T1ACP0 T1BCP2 T1BCP1 T1BCP0 T0CP2
TM Input/Output Pin Control Register List
1
T0CP1
T0CP1
0
T0CP0
T0CP0
Rev. 1.10
68
March 25, 2013
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