HT49CV7 datasheet(20/48 Pages) HOLTEK

20 / 48 page

HT49RV7/HT49CV7

Rev. 1.00

April 20, 2006

applied to PA3 by options. No matter what the operation

mode is, writinga0to ET0I or ET1I disables the related

interrupt service. When the PFD function is selected, ex-

ecuting

²SET [PA].3² instruction will enable the PFD

output and executing

²CLR [PA].3² instruction will dis-

able the PFD output.

In the case of timer/event counter OFF condition, writing

data to the timer/event counter preload register also re-

loads that data to the timer/event counter. But if the

timer/event counter is turned on, data written to the

timer/event counter is kept only in the timer/event coun-

ter preload register. The timer/event counter still contin-

ues its operation until an overflow occurs.

When the timer/event counter (reading TMR0/TMR1) is

read, the clock is blocked to avoid errors, as this may re-

sults in a counting error. Blocking of the clock should be

taken into account by the programmer. It is strongly rec-

ommended to load a desired value into the TMR0/TMR1

counter, for proper operation since the initial value of the

TMR0/TMR1 is unknown. Due to the timer/event coun-

ter scheme, the programmer should pay special atten-

tion on the instruction to enable then disable the timer

for the first time, whenever there is a need to use the

timer/event counter function, to avoid unpredictable re-

sult. After this procedure, the timer/event function can

be operated normally.

Bits 2~0 of the TMR0C can be used to define the

pre-scaling stages of the internal clock sources of the

timer/event counter. The definitions are as shown. The

overflow signal of the timer/event counter can be used

to generate the PFD signal. The timer prescaler is also

used as the PWM counter.

Remote Control Timer

- RMT

The HT49RV7/HT49CV7 provides an 8-bit remote con-

trol timer that has a pulse width measurement function.

Pulse width is measured from a difference in count value

when the valid edge (RMT pin) has been detected while

the timer operates in the running mode.

N o i s e R e j e c t i o n

R i s i n g E d g e

D e t e c t i o n

R e m o t e C o n t r o l T i m e r

C a p t u r e R e g i s t e r

R M T 0 ( 2 2 H )

8 - b i t T i m e r C o u n t e r

R e m o t e C o n t r o l T i m e r

C a p t u r e R e g i s t e r

R M T 1 ( 2 3 H )

N o i s e R e j e c t i o n

F a l l i n g E d g e

D e t e c t i o n

P r e - s c a l e r

f X / 2 5 ~ f X / 2 8

4 - 1 M U X

R M S 1 R M S 0

R M E

f X

R M C S

f S Y S

f S Y S / 4

R M T

L a t c h

I n t e r r u p t ( R M T 0 F )

I n t e r r u p t ( R M T 1 F )

C l e a r

O v e r f l o w ( R M T V F )

Remote Control Timer

Bit No.

Label

Function

Unused bit, read as

²0²

ERMT0

Controls the remote control timer rising edge interrupt (1=enable; 0=disable)

ERMT1

Controls the remote control timer falling edge interrupt (1=enable; 0=disable)

ERMTV

Controls the remote control timer overflow interrupt (1=enable; 0=disable)

RME

Controls the remote control timer (1=enable; 0=disable)

1=enable & start counting; 0=disable & clear the counter to 0

RMCS

Selects the remote control timer clock source fX (1=fSYS; 0=fSYS/4)

6~7

RMS0

RMS1

Selects the remote control timer clock

00=fX/2

01= fX/2

10= fX/2

11= fX/2

RMTC (21H) Register

Note: The RMT pin with rising/falling edge wake-up function, 8-bit timer counter will be cleared during a chip reset.

HT49CV7 Datasheet(PDF) 20 Page - Holtek Semiconductor Inc

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