HT56R668 datasheet(39/104 Pages) HOLTEK

39 / 104 page

HT56R67/HT56R668/HT56C668/HT56R678/HT56C678/HT56R688

Rev. 1.20

March 4, 2010

V A

V B

V S S

C O M 0

C O M 1

O n

O f f

C O M 0

S e g m e n t s O n

O n

O f f

O n

O f f

O n

O f f

C O M 1

S e g m e n t s O n

O n

O f f

O n

O f f

O n

O f f

C O M 0

S e g m e n t s O f f

O f f

O n

O f f

O n

O f f

O n

O f f

V A

V B

V S S

V A

V B

V S S

V A

V B

V S S

V A

V B

V S S

O n

O f f

O n

O f f

O n

O f f

Note: For 1/2 bias, the VA=VLCD1, VB=VLCD1

´1/2 for both R and C type.

LCD Driver Output

- Type B - 1/2 Duty, 1/2 Bias

Timer/Event Counters

The provision of timers form an important part of any

microcontroller, giving the designer a means of carrying

out time related functions. The devices contain several

8-bit and 16-bit count-up timers. As each timer has three

different operating modes, they can be configured to op-

erate as a general timer, an external event counter or as

a pulse width measurement device. The provision of a

prescaler to the clock circuitry of the 8-bit Timer/Event

Counter also gives added range to this timer.

There are two types of registers related to the

Timer/Event Counters. The first are the registers that

contain the actual value of the Timer/Event Counter and

into which an initial value can be preloaded. Reading

from these registers retrieves the contents of the

Timer/Event Counter. The second type of associated

timer options and determines how the Timer/Event

Counter is to be used. The Timer/Event Counters can

have the their clock configured to come from an internal

clock source. In addition, their clock source can also be

configured to come from an external timer pin.

Configuring the Timer/Event Counter Input Clock

Source

The internal timer

¢s clock can originate from various

sources. The system clock source is used when the

Timer/Event Counter is in the timer mode or in the pulse

width measurement mode. For the 8-bit Timer/Event

Counter this internal clock source is fSYS which is also di-

vided by a prescaler, the division ratio of which is condi-

tioned by the Timer Control Register, TMRnC, bits

TnPSC0~ TnPSC2. For the 16-bit Timer/Event Counter

this internal clock source can be chosen from a combi-

nation of internal clocks using a configuration option and

the TnS bit in the TMRnC register.

An external clock source is used when the timer is in the

event counting mode, the clock source being provided

on an external timer pin TMR0, TMR1, TMR2 or TMR3

depending upon which timer is used. Depending upon

the condition of the TnE bit, each high to low, or low to

high transition on the external timer pin will increment

the counter by one.

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