HT46R0664 datasheet(46/92 Pages) HOLTEK

46 / 92 page

Rev. 1.00

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Rev. 1.00

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HT46R0664

Enhanced A/D+LCD Type 8-Bit OTP MCU

T0 ON

Pr el oad R eg is te r

Up C oun te r

Da ta B us

PF D0

TC 0

T0 EG

M ode C on tr ol

Ti me r 0 In te r nal C lo c k

(f T0 CK )

Ov er fl ow

to In te rr up t

T0 M1 , T0 M0

T0 OV

8-bit Timer/Event Counter 0 Structure

f SY S /4

LX T Os ci ll at or

T1 S

T1 ON

Pr el oad R eg is te r

Up C oun te r

D at a Bu s

PF D 1

TC 1

T1 EG

M ode C on tr ol

Ov er fl ow

to In te rr up t

T1 M1 , T 1M 0

T1 OV

8-bit Timer/Event Counter 1 Structure

PFD0

PFD1

PFDCS

MUX

PFD output

Timer Registers – TMR0, TMR1

The timer registers are special function registers located in the Special Purpose Data Memory and

is the place where the actual timer value is stored. These registers are known as TMR0 and TMR1.

The value in the timer registers increases by one each time an internal clock pulse is received or an

external transition occurs on the external timer pin. The timer will count from the initial value loaded

by the preload register to the full count of FFH at which point the timer overflows and an internal

interrupt signal is generated. Then the timer value will be reset with the initial preload register value

and continue counting. Note that to achieve a maximum full range count of FFH, all the preload

registers must first be cleared to zero. It should be noted that after power-on, the preload registers

will be in an unknown condition. Note that if the Timer/Event Counter is in an OFF condition and

data is written to its preload register, this data will be immediately written into the actual counter.

However, if the counter is enabled and counting, any new data written into the preload data register

during this period will remain in the preload register and will only be written into the actual counter

the next time an overflow occurs.

Timer Control Registers – TMR0C, TMR1C

The flexible features of the Holtek microcontroller Timer/Event Counters enable them to operate in

three different modes, the options of which are determined by the contents of their respective control

with its corresponding timer registers that control the full operation of the Timer/Event Counter.

Before the timer can be used, it is essential that the Timer Control Register is fully programmed with

the right data to ensure its correct operation, a process that is normally carried out during program

initialisation. To choose which of the three modes the timer is to operate in, either in the timer mode,

the event counting mode or the pulse width capture mode, bits 7 and 6 of the Timer Control Register,

which are known as the bit pair TnM1/TnM0, must be set to the required logic levels. The timer-on

bit, which is bit 4 of the Timer Control Register and known as TnON, provides the basic on/off

HT46R0664 Datasheet(PDF) 46 Page - Holtek Semiconductor Inc

HT46R0664 Datasheet(HTML) 46 Page - Holtek Semiconductor Inc

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