HT48RA0-5 Holtek Semiconductor, HT48RA0-5 Datasheet - Page 13

• Manufacturer Part Number: HT48RA0-5
• Description: Remote Type 8-Bit OTP MCU
• Manufacturer: Holtek Semiconductor

Note:
The down counter is decremented ( 1) in the cycle of
64/f
the zero detector generates the timer operation end sig-
nal to stop the timer operation. At this time, TOEF will be
set to 1 . The output of the timer operation end signal is
continued while the down counter is 0 and the timer is
stopped. The following relational expression applies be-
tween the timer s output time and the down counter s
set value.
Timer output time = (Set value+1)
An example is shown below.
MOV A,0FFH
MOV TSR0,A
MOV A,01H
MOV TSR1,A
SET TSR1.1
Rev.1.00
If the TSR1.1 is cleared during the timer counting, the
timer will be stopped. Once the TSR1.1 is set
(1 0 1), the down counter will reload data from
t8~t0, and then the down counter begins counting
down with the new load data.
If TSR1.1 and TOEF are equal to 1 both, the timer can
re-start, after new data is written to TSR0, TSR1
(t0~t8) in sequence.
SYS
. If the value of the down counter becomes 0 ,
If the contents of the Down counter is 000H, set
the t9 to start the timer counting, the timer will
on l y c ount 1 st ep. The t imer out put
time=64/f
SYS
.
[ (0+1)
64/f
64/f
SYS
SYS
=64/f
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Timer Configuration
]
13
In the case above, the timer output time is as follows.
(Set value+1)
= (511+1)
= 8.192ms
Setting the t9 bit channels the timer to the REM/REMDRV
pin. The REM/REMDRV pin will be a combination of the
timer and carrier signals.
Note:
Timer Output when Carrier is not Output
The carrier output results if bit 9 of the high-level
period setting modulo register (CARH) is
cleared ( 0 ).
16 s
64/f
SYS
HT48RA0-5
March 23, 2010
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