參數(shù)資料
型號(hào): HT48R30A
廠商: Holtek Semiconductor Inc.
元件分類: 數(shù)學(xué)處理器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁數(shù): 17/43頁
文件大?。?/td> 710K
代理商: HT48R30A
HT48R30A-1
Rev. 1.10
17
July 2, 2001
Timer/Event Counter
Timer/event counters (TMR) is implemented in
the microcontroller. The timer/event counter
contains an 8-bit programmable count-up coun-
ter and the clock may come from an external
source or from the system clock or RTC.
Using the internal clock sources, there are 2
reference time-bases for timer/event counter.
The internal clock source can be selected as
coming from f
SYS
(can always be optioned) or
f
RTC
(enabled only system oscillator in the Int.
RC+RTC mode) by ROM code option. The exter-
nalclockinputallowstheusertocountexternal
events, measure time intervals or pulse widths,
or to generate an accurate time base and PFD
signals.
Label (TMRC)
Bits
Function
PSC0~PSC2
0~2
To define the prescaler stages, PSC2, PSC1, PSC0=
000: f
INT
=f
SYS
/2 or f
RTC
/2
001: f
INT
=f
SYS
/4 or f
RTC
/4
010: f
INT
=f
SYS
/8 or f
RTC
/8
011: f
INT
=f
SYS
/16 or f
RTC
/16
100: f
INT
=f
SYS
/32 or f
RTC
/32
101: f
INT
=f
SYS
/64 or f
RTC
/64
110: f
INT
=f
SYS
/128 or f
RTC
/128
111: f
INT
=f
SYS
/256 or f
RTC
/256
TE
3
To define the TMR0 active edge of timer/event counter 0
(0=active on low to high; 1=active on high to low)
TON
4
To enable/disable timer 0 counting
(0=disabled; 1=enabled)
5
Unused bit, read as"0"
TM0
TM1
6
7
To define the operating mode
01=Event count mode (external clock)
10=Timer mode (internal clock)
11=Pulse width measurement mode
00=Unused
TMRC register
' -
# + ! ,
!
+ ' !
#) ! ' !
+ ' #!
# !
!
!' /
+
)
! ' !
" !
/ 1
/ 1
3 ; ! '
3 ; '
.
' + ' " ! #
8 .
2 4 9
Timer/Event Counter
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