參數(shù)資料
型號: HT48R30A-1
廠商: Holtek Semiconductor Inc.
英文描述: 8-Bit High Performance RISC-like Microcontroller Suitable for Multiple I/O Application(高性能、指令類似RISC的8位微控制器,用于多I/O接口設(shè)備)
中文描述: 8位高性能RISC架構(gòu)微控制器等的多個I / O應(yīng)用(高性能,指令類似的RISC的8位微控制器,用于多予適用/輸出接口設(shè)備)
文件頁數(shù): 17/47頁
文件大?。?/td> 306K
代理商: HT48R30A-1
HT48R30A-1
17
November 29, 2000
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
To define the TMR0 active edge of timer/event counter 0
(0=active on low to high; 1=active on high to low)
TE
3
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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