ht82k95ee Holtek Semiconductor Inc., ht82k95ee Datasheet - Page 15

• Manufacturer Part Number: ht82k95ee
• Description: Ht82k95ee/ht82k95ae -- Usb Multimedia Keyboard Encoder 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

Using the internal clock source, there is only 1 reference
time-base for Timer/Event Counter 0. The internal clock
source is coming from f
The external clock input allows the user to count exter-
nal events, measure time intervals or pulse widths.
Using the internal clock source, there is only 1 reference
time-base for Timer/Event Counter 1. The internal clock
source is coming from f
allows the user to count external events, measure time
intervals or pulse widths.
There are 2 registers related to the Timer/Event Counter
0; TMR0 ([0DH]), TMR0C ([0EH]). Two physical regis-
ters 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 op-
tions.
There are 3 registers related to Timer/Event Counter 1;
TMR1H (0FH), TMR1L (10H), TMR1C (11H). Writing
TMR1L will only put the written data to an internal
lower-order byte buffer (8 bits) and writing TMR1H will
transfer the specified data and the contents of the
lower-order byte buffer to TMR1H and TMR1L preload
registers, respectively. The Timer/Event Counter 1
preload register is changed by each writing TMR1H op-
erations. Reading TMR1H will latch the contents of
TMR1H and TMR1L counters to the destination and the
lower-order byte buffer, respectively. Reading the
TMR1L will read the contents of the lower-order byte
buffer. The TMR1C is the Timer/Event Counter 1 control
register, which defines the operating mode, counting en-
able or disable and active edge.
Rev. 1.20
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/4.
/4. The external clock input
Timer/Event Counter 0
Timer/Event Counter 1
15
The TM0, TM1 bits define the operating mode. The
event count mode is used to count external events,
which means the clock source comes from an external
(TMR0/TMR1) pin. The timer mode functions as a nor-
mal timer with the clock source coming from the f
(Timer0/Timer1). The pulse width measurement mode
can be used to count the high or low level duration of the
external signal (TMR0/TMR1). The counting is based on
the f
In the event count or timer mode, once the Timer/Event
Counter 0/1 starts counting, it will count from the current
contents in the Timer/Event Counter 0/1 to FFH or
FFFFH. Once overflow occurs, the counter is reloaded
from the Timer/Event Counter 0/1 preload register and
generates the interrupt request flag (T0F/T1F; bit 5/6 of
INTC) at the same time.
In the pulse width measurement mode with the TON
and TE bits equal to one, once the TMR0/TMR1 has re-
ceived a transient from low to high (or high to low if the
TE bits is 0 ) it will start counting until the TMR0/TMR1
returns to the original level and resets the TON. The
measured result will remain in the Timer/Event Counter
0/1 even if the activated transient occurs again. In other
words, only one cycle measurement can be done. Until
setting the TON, the cycle measurement will function
again as long as it receives further transient pulse. Note
that, in this operating mode, the Timer/Event Counter
0/1 starts counting not according to the logic level but
according to the transient edges. In the case of counter
overflows, the Counter 0/1 is reloaded from the
Timer/Event Counter 0/1 preload register and issues the
interrupt request just like the other two modes. To en-
able the counting operation, the timer ON bit (TON; bit 4
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/4 (Timer0/Timer1).
HT82K95EE/HT82K95AE
August 28, 2006
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