HT56R23 datasheet(49/127 Pages) HOLTEK

49 / 127 page

HT56R22/HT56R23/HT56R24/HT56R25/HT56R26

Rev. 1.30

December 26, 2014

b 7

T n E

T n O N

T n M 0

T n M 1

b 0

T M R n C R e g i s t e r ( n = 1 )

N o t i m p l e m e n t e d , r e a d a s " 0 "

E v e n t C o u n t e r a c t i v e e d g e s e l e c t

1 : c o u n t o n f a l l i n g e d g e

0 : c o u n t o n r i s i n g e d g e

P u l s e W i d t h M e a s u r e m e n t a c t i v e e d g e s e l e c t

1 : s t a r t c o u n t i n g o n r i s i n g e d g e , s t o p o n f a l l i n g e d g e

0 : s t a r t c o u n t i n g o n f a l l i n g e d g e , s t o p o n r i s i n g e d g e

T i m e r / E v e n t C o u n t e r c o u n t i n g e n a b l e

1 : e n a b l e

0 : d i s a b l e

T n M 1

T n M 0

n o m o d e a v a i l a b l e

e v e n t c o u n t e r m o d e

t i m e r m o d e

p u l s e w i d t h m e a s u r e m e n t m o d e

O p e r a t i n g m o d e s e l e c t

T i m e r c l o c k s o u r c e

1 : f S U B ( 3 2 7 6 8 H z o r 3 2 K R C )

0 : f S Y S / 4

T n S

Timer/Event Counter Control Register

- TMRnC

Timer Control Registers

TMR0C, TMR1C, TMR2C, TMR3C

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 register.

It is the Timer Control Register together with its corre-

sponding timer registers that control the full operation of

the Timer/Event Counters. Before the timers can be

used, it is essential that the appropriate Timer Control

sure its correct operation, a process that is normally car-

ried out during program initialisation.

To choose which of the three modes the timer is to oper-

ate in, either in the timer mode, the event counting mode

or the pulse width measurement mode, bits 7 and 6 of

the corresponding Timer Control Register, which are

known as the bit pair TnM1/TnM0, must be set to the re-

quired logic levels. The timer-on bit, which is bit 4 of the

Timer Control Register and known as TnON, depending

upon which timer is used, provides the basic on/off con-

trol of the respective timer. Setting the bit high allows the

counter to run, clearing the bit stops the counter. For

timers that have prescalers, bits 0~2 of the Timer Con-

trol Register determine the division ratio of the input

clock prescaler. The prescaler bit settings have no effect

if an external clock source is used. If the timer is in the

event count or pulse width measurement mode, the ac-

tive transition edge level type is selected by the logic

level of bit 3 of the Timer Control Register which is

known as TnE. An additional T1S bit in the 16-bit

Timer/Event Counter control register is used to deter-

mine the clock source for the Timer/Event Counter.

HT56R23 Datasheet(PDF) 49 Page - Holtek Semiconductor Inc

HT56R23 Datasheet(HTML) 49 Page - Holtek Semiconductor Inc

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