HT49RV3 查看數據表（PDF） - Holtek Semiconductor

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HT49RV3

VFD Type 8-Bit MCU

Holtek Semiconductor 

HT49RV3/HT49CV3

Remote Control Timer - RMT

The HT49RV3/HT49CV3 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.

The RMT pin with rising/falling edge wake-up function,

8-bit timer counter will be cleared during a chip reset.

And the RMT clock starts to count after the rising/falling

edge trigger.

N o is e R e je c tio n

R e m o te C o n tr o l T im e r

RM T

R is in g E d g e

C a p tu r e R e g is te r

D e te c tio n

L a tc h

R M T 0 (2 2 H )

fS Y S

fS Y S /4

M fX

U

X

fX /2 5~ fX /2 8

P r e - s c a le r

4 -1 M U X

RM CS RM S1 RM S0 RM E

8 - b it T im e r C o u n te r

C le a r

N o is e R e je c tio n L a tc h R e m o te C o n tr o l T im e r

F a llin g E d g e

C a p tu r e R e g is te r

D e te c tio n

R M T 1 (2 3 H )

In te rru p t (R M T 0 F )

O v e r flo w ( R M T V F )

In te rru p t (R M T 1 F )

Remote Control Timer

Bit No.

0

1

2

3

4

5

6~7

Label

Function

¾ 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 & start count; 0=disable & clear counter)

RMCS

RMS0

RMS1

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

Selects the remote control timer clock

00=fX/25

01= fX/26

10= fX/27

11= fX/28

RMTC (21H) Register

Bit No.

0

1

2

3

4

5~7

Label

Function

RMTVF

Remote control timer overflow interrupt flag (1=indicates that an overflow has occurred; 0=in-

dicates that an overflow has not occurred)

RTF

Real time clock interrupt flag (1=indicates that an RTC interrupt has occurred; 0=indicates that

an RTC interrupt has not occurred)

RMT0F

Remote control timer rising edge interrupt flag (1=indicates that a rising edge interrupt has oc-

curred; 0=indicates that a rising edge interrupt has not occurred)

RMT1F

Remote control timer falling edge interrupt flag (1=indicates that a falling edge interrupt has

occurred; 0=indicates that a falling edge interrupt has not occurred)

ERTI Controls the Real Time Clock interrupt (1=enable; 0=disable)

¾ Unused bit, read as ²0²

MFIS (29H) Register

Rev. 1.30

19

March 20, 2007

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