參數(shù)資料
型號(hào)： 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(gè)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(yè)數(shù)： 12/47頁(yè)
文件大?。?/td> 306K
代理商： HT48R30A-1
HT48R30A-1
12
November 29, 2000
used to control the enabling/disabling of inter-
rupts. These bits prevent the requested inter-
rupt from being serviced. Once the interrupt
request flags (TF, EIF) are set, they will remain
in the INTC register until the interrupts are
serviced or cleared by a software instruction.
It is recommended that a program does not
use the "CALL subroutine" within the inter-
rupt subroutine. Interrupts often occur in an
unpredictable manner or need to be serviced
immediately in some applications. If only one
stack is left and enabling the interrupt is not
well controlled,theoriginalcontrolsequencewill
be damaged once the "CALL" operates in the in-
terrupt subroutine.
Oscillator configuration
There are 3 oscillator circuits in the
microcontroller.
All of them are designed for system clocks,
namely the external RC oscillator, the external
Crystal oscillator and the internal RC
oscillator, which are determined by ROM code
option. No matter what oscillator type is se-
lected, the signal provides the system clock.
The HALT mode stops the system oscillator and
ignores an external signal to conserve power.
If an RC oscillator is used, an external resistor
between OSC1 and VDD is required and the
resistance must range from 51k
system clock, divided by 4, is available on
OSC2, which can be used to synchronize exter-
nal logic. The RC oscillator provides the most
cost effective solution. However, the frequency
of oscillation may vary with VDD, tempera-
tures and the chip itself due to process varia-
tions. It is, therefore, not suitable for timing
sensitive operations where an accurate oscilla-
tor frequency is desired.
to 1M . The
If the Crystal oscillator is used, a crystal across
OSC1 and OSC2 is needed to provide the feed-
back and phase shift required for the oscillator.
No other external components are required. In
stead of a crystal, a resonator can also be con-
nected between OSC1 and OSC2 to get a fre-
quency reference, but two external capacitors
in OSC1 and OSC2 are required. If the internal
RC oscillator is used, the OSC1 and OSC2 can
be selected as gene ral I/O lines or an 32768Hz
crystal oscillator (RTC OSC). Also, the frequen-
cies of the internal RC oscillator can be
3.2MHz, 1.6MHz, 800kHz and 400kHz (de-
pends on the options).
The oscillator is a free running on-chip RC oscil-
lator, and no external components are required.
Even if the system enters the power down mode,
thesystemclockisstopped,buttheoscillatorstill
works within a period of 72 s. The WDT oscilla-
tor can be disabled by ROM code option to con-
serve power.
Watchdog Timer
WDT
The WDT clock source is implemented by a ded-
icated RC oscillator (WDT oscillator), RTC
* ! ' = &
3 ; @ # ! ' !
-
'
0 ; @ # ! ' !
3 ; ! ; '
-
' # ; !
- . -
+
" ! #
!
-
'
Watchdog Timer
* !' #
8 + ' 5 0 4 3 > 9
' #
' " '
#
&
& 0 " 7
System oscillator
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