參數(shù)資料
型號(hào)： HMS81004E
廠商： Hynix Semiconductor Inc.
元件分類(lèi)： 8位微控制器
英文描述： HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： Hynix半導(dǎo)體公司的8位單芯片微控制器
文件頁(yè)數(shù)： 47/77頁(yè)
文件大?。?/td> 1112K
代理商： HMS81004E
HMS81004E/08E/16E/24E/32E
44
JUNE 2001 Ver 1.00
2) Timer0, Timer1
TIMER0 and TIMER1 have an up-counter. When value of
the up-counter reaches the content of Timer Data Register
(TDR), the up-counter is cleared to “00h”, and interrupt
(IFT0, IFT1) is occured at the next clock.
For Timer0, the internal clock (PS) and the external clock
(EC) can be selected as counter clock. But Timer1 and
Timer2 use only internal clock. As internal clock. Timer0
can be used as internal-timer which period is determined
by Timer Data Register (TDR). Chosen as external
clock, Timer0 executes as event-counter. The counter ex-
ecution of Timer0 and Timer1 is controlled by T0CN,
T0ST, CAP0, T1CN, T1ST, of Timer Mode Register TM0
and TM1. T0CN, T1CN are used to stop and start Timer0
and Timer1 without clearing the counter. T0ST, T1ST is
used to clear the counter. For clearing and starting the
counter, T0ST or T1ST should be temporarily set to “0”
and then set to “1”. T0CN, T1CN, T0ST and T1ST should
be set “1”, when Timer counting-up. Controlling of
CAP0 enables Timer0 as input capture. By programming
of CAP0 to “1”, the period of signal from INT2 can be
measured and then, event counter value for INT2 can be
read. During counting-up, value of counter can be read-
Timer execution is stopped by the reset signal(RE-
SET=”L”)
Note:
In the process of reading 16-bit Timer Data, first
read the upper 8-bit data. Then read the lower 8-bit data,
and read the upper 8-bit data again. If the earlier read up-
per 8-bit data are matched with the later read upper 8-bit
data, read 16-bit data are correct. If not, caution should be
taken in the selection of upper 8-bit data.
(Example)
1) Upper 8-bit Read 0A 0A
2) Lower 8-bit Read FF 01
3) Upper 8-bit Read 0B 0B
=====================
0AFF 0B01
Figure 13-5 Operation of Timer0
~
Timer 0 (IFT0)
Interrupt
T0 Data
Register
Value
TIME
Occur interrupt
Occur interrupt
Occur interrupt
Interrupt period
upcoun
~
~
0
1
2
3
4
5
6
MATCH
(TDR = T0)
0
T0 Value
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