HT66F30 datasheet(77/224 Pages) HOLTEK

77 / 224 page

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

Rev. 1.00

November 3, 2009

TM Operation

The three different types of TM offer a diverse range of

functions, from simple timing operations to PWM signal

generation. The key to understanding how the TM oper-

ates is to see it in terms of a free running counter whose

value is then compared with the value of

pre-programmed internal comparators. When the free

running counter has the same value as the

pre-programmed comparator, known as a compare

match situation, a TM interrupt signal will be generated

which can clear the counter and perhaps also change

the condition of the TM output pin. The internal TM

counter is driven by a user selectable clock source,

which can be an internal clock or an external pin.

TM Clock Source

The clock source which drives the main counter in each

TM can originate from various sources. The selection of

the required clock source is implemented using the

TnCK2~TnCK0 bits in the TM control registers. The

clock source can be a ratio of either the system clock

fSYS or the internal high clock fH, the fTBC clock source or

the external TCKn pin. Note that setting these bits to the

value 101 will select a reserved clock input, in effect dis-

connecting the TM clock source. The TCKn pin clock

source is used to allow an external signal to drive the TM

as an external clock source or for event counting.

TM Interrupts

The Compact and Standard type TMs each have two in-

ternal interrupts, one for each of the internal comparator

A or comparator P, which generate a TM interrupt when

a compare match condition occurs. As the Enhanced

type TM has three internal comparators and comparator

A or comparator B or comparator P compare match

functions, it consequently has three internal interrupts.

When a TM interrupt is generated it can be used to clear

the counter and also to change the state of the TM out-

put pin.

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 es-

sentially a clock source for the TM and is selected using

the TnCK2~TnCK0 bits in the TMnC0 register. This ex-

ternal 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 la-

bel 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 func-

tion, 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 out-

put pins for each TM type and device is different, the de-

tails are provided in the accompanying table.

Device

CTM

STM

ETM

Registers

HT66F20

TP0_0

TP1_0, TP1_1

TMPC0

HT66F30

TP0_0, TP0_1

TP1A, TP1B_0,

TP1B_1

TMPC0

HT66F40

TP0_0, TP0_1

TP2_0, TP2_1

TP1A, TP1B_0,

TP1B_1, TP1B_2

TMPC0, TMPC1

HT66F50

TP0_0, TP0_1

TP3_0, TP3_1

TP2_0, TP2_1

TP1A, TP1B_0,

TP1B_1, TP1B_2

TMPC0, TMPC1

HT66F60

TP0_0, TP0_1

TP3_0, TP3_1

TP2_0, TP2_1

TP1A, TP1B_0,

TP1B_1, TP1B_2

TMPC0, TMPC1

TM Output Pins

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