HT48C50-1 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT48C50-1

I/O Type 8-Bit MCU

Holtek Semiconductor 

HT48R50A-1/HT48C50-1

Timer/Event Counter

Two timer/event counters (TMR0, TMR1) are imple-

mented in the microcontroller. The Timer/Event Counter

0 contains an 8-bit programmable count-up counter and

the clock may come from an external source or from the

system clock or RTC.

The Timer/Event Counter 1 contains an 16-bit program-

mable count-up counter and the clock may come from

an external source or from the system clock divided by 4

or RTC.

Using the internal clock sources, there are 2 reference

time-bases for Timer/Event Counter 0. The internal

clock source can be selected as coming from fSYS (can

always be optioned) or fRTC (enabled only system oscil-

lator in the Int. RC+RTC mode) by options.

Using the internal clock sources, there are 2 reference

time-bases for Timer/Event Counter 1. The internal

clock source can be selected as coming from fSYS/4

(can always be optioned) or fRTC (enable only the sys-

tem oscillator in the Int. RC+RTC mode) by options.

Using external clock input allows the user to count exter-

nal events, measure time internals or pulse widths, or

generate an accurate time base. While using the inter-

nal clock allows the user to generate an accurate time

base.

The Timer/Event Counter 0 can generate PFD signal by

using external or internal clock and PFD frequency is

determine by the equation fINT/[2´(256-N)].

There are 2 registers related to the Timer/Event Counter

0; TMR0 ([0DH]), TMR0C ([0EH]). Two physical registers

are mapped to TMR0 location; writing TMR0 makes the

starting value be placed in the Timer/Event Counter 0

preload register and reading TMR0 gets the contents of

the Timer/Event Counter 0. The TMR0C is a timer/event

counter control register, which defines some options.

Bit No.

0

1

2

3

4

5

6

7

Label

Function

T0PSC0

T0PSC1

T0PSC2

To define the prescaler stages, T0PSC2, T0PSC1, T0PSC0=

000: fINT=fSYS/2 or fRTC/2

001: fINT=fSYS/4 or fRTC/4

010: fINT=fSYS/8 or fRTC/8

011: fINT=fSYS/16 or fRTC/16

100: fINT=fSYS/32 or fRTC/32

101: fINT=fSYS/64 or fRTC/64

110: fINT=fSYS/128 or fRTC/128

111: fINT=fSYS/256 or fRTC/256

T0E

To define the TMR0 active edge of Timer/Event Counter 0

(0=active on low to high; 1=active on high to low)

T0ON To enable or disable timer 0 counting (0=disabled; 1=enabled)

¾ Unused bit, read as ²0²

T0M0

T0M1

To define the operating mode

01=Event count mode (external clock)

10=Timer mode (internal clock)

11=Pulse width measurement mode

00=Unused

TMR0C (0EH) Register

Bit No.

0~2, 5

3

4

6

7

Label

¾

T1E

T1ON

T1M0

T1M1

Function

Unused bit, read as ²0²

To define the TMR1 active edge of Timer/Event Counter 1

(0=active on low to high; 1=active on high to low)

To enable or disable timer 1 counting (0=disabled; 1=enabled)

To define the operating mode

01=Event count mode (external clock)

10=Timer mode (internal clock)

11=Pulse width measurement mode

00=Unused

TMR1C (11H) Register

Rev. 2.00

14

March 8, 2006

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