ht82m9be Holtek Semiconductor Inc., ht82m9be Datasheet - Page 14

• Manufacturer Part Number: ht82m9be
• Description: Ht82m99e/ht82m99a -- Usb Mouse Encoder 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

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.
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.
Rev. 1.60
Bit No.
Bit No.
0~2, 5
0~2, 5
SYS
3
4
6
7
3
4
6
7
/4 (Timer0/Timer1).
Label
Label
TON
TON
TM0
TM1
TM0
TM1
TE
TE
Unused bit, read as 0
To define the TMR0 active edge of Timer/Event Counter 0
(0=active on low to high; 1=active on high to low)
To enable/disable timer 0 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
Unused bit, read as 0
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/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
TMR0C (0EH) Register
TMR1C (11H) Register
SYS
/4
14
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
of TMR0C/TMR1C) should be set to 1. In the pulse width
measurement mode, the TON will be cleared automati-
cally after the measurement cycle is completed. But in
the other two modes the TON can only be reset by in-
structions. The overflow of the Timer/Event Counter 0/1
is one of the wake-up sources. No matter what the oper-
ation mode is, writing a 0 to ET0I/ET1I can disable the
corresponding interrupt services.
In the case of Timer/Event Counter 0/1 OFF condition,
writing data to the Timer/Event Counter 0/1 preload regis-
ter will also reload that data to the Timer/Event Counter
0/1. But if the Timer/Event Counter 0/1 is turned on, data
written to it will only be kept in the Timer/Event Counter
0/1 preload register. The Timer/Event Counter 0/1 will still
Function
Function
HT82M9BE/HT82M9BA
April 16, 2008