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参数资料
| 型号： | HT86144(68PLCC) |
| 英文描述： | Microcontroller |
| 中文描述： | 微控制器 |
| 文件页数： | 17/28页 |
| 文件大小： | 195K |
| 代理商： | HT86144(68PLCC) |
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HT86XXX
Rev. 1.00
17
November 1, 2002
RegisterBit No. Label
Function
INTCH
(1EH)
0
ET2I
Controls the timer 2 interrupt
(1= enabled; 0= disabled)
1
ET3I
Controls the timer 3 interrupt
(1= enabled; 0= disabled)
2, 3
Unused bit, read as 0
4
T2F
Timer 2 interrupt request flag
(1= active; 0= inactive)
5
T3F
Timer 3 interrupt request flag
(1= active; 0= inactive)
6, 7
Unused bit, read as 0
INTC1 register
Interrupt Source
Priority
Vector
External Interrupt
1
04H
Timer/Event Counter 0 Overflow
2
08H
Timer/Event Counter 1 Overflow
3
0CH
Timer Counter 2 Overflow
4
10H
Timer Counter 3 Overflow
5
14H
Oscillator configuration
The HT86XXX provides two types of oscillator circuit for
the system clock, i.e., RC oscillator and crystal oscilla-
tor. No matter what type of oscillator, the signal is used
for the system clock. The HALT mode stops the system
oscillatorandignoresexternalsignaltoconservepower.
If the RC oscillator is used, an external resistor between
OSC1 and VSS is required, and the range of the resis-
tance should be from 30k
divided by 4, is available on OSC2 with pull-high resis-
tor, which can be used to synchronize external logic.
The RC oscillator provides the most cost effective solu-
tion. However, the frequency of the oscillation may vary
with VDD, temperature, and the chip itself due to pro-
cessvariations.Itisthereforenotsuitablefortimingsen-
sitive operations where accurate oscillator frequency is
desired.
to 680k . The system clock,
On the other hand, if the crystal oscillator is selected, a
crystalacrossOSC1andOSC2isneededtoprovidethe
feedback and phase shift required for the oscillator, and
no other external components are required. A resonator
may be connected between OSC1 and OSC2 to replace
the crystal and to get a frequency reference, but two ex-
ternal capacitors in OSC1 and OSC2 are required.
There is another oscillator circuit designed for Timer3 s
clock source as the RTC time base which is determined
by mask option. If the mask option determines that
Timer3 s clock source is from a 32kHz crystal, then a
32kHz crystal should be connected to the last two pins
of I/O port C, i.e., PC6 and PC7.
Watchdog Timer
WDT
The WDT clock source is implemented by a dedicated
RC oscillator (WDT oscillator) or instruction clock (sys-
tem clock divided by 4), decided by mask options. This
timer is designed to prevent a software malfunction or
sequence jumping to an unknown location with unpre-
dictable results. The Watchdog Timer can be disabled
by mask option. If the Watchdog Timer is disabled, all
theexecutionsrelatedtotheWDTresultinnooperation.
Once the internal WDT oscillator (RC oscillator with pe-
riod 78 s normally) is selected, it is first divided by 256
(8-stages) to get the nominal time-out period of approxi-
mately 20 ms. This time-out period may vary with tem-
perature, VDD and process variations. By invoking the
WDT prescaler, longer time-out period can be realized.
Writing data to WS2, WS1, WS0 (bit 2,1,0 of
WDTS(09H)) can give different time-out period.
"
- '
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- -
8
1 9
8
. 9
System oscillator
"
'
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4 5 /
'
,
'
-
1 5 /
'
4 5
5 '
,
'
5
,
2 ,
-
,
Watchdog Timer
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