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參數(shù)資料
| 型號： | HT36A1 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Music Synthesizer 8-Bit MCU |
| 中文描述： | 音樂合成器8位微控制器 |
| 文件頁數(shù)： | 12/39頁 |
| 文件大?。?/td> | 286K |
| 代理商： | HT36A1 |
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HT36A1
Rev. 1.00
12
August 15, 2005
The contents of the on-chip RAM and registers remain
unchanged
The WDT and WDT prescaler will be cleared and
starts to count again (if the clock comes from the WDT
oscillator).
All I/O ports maintain their original status.
The PDF flag is set and the TO flag is cleared.
The HALT pin will output a high level signal to disable
the external ROM.
The system can leave the HALT mode by means of an
external reset, an interrupt, an external falling edge sig-
nal on port A or a WDT overflow. An external reset
causes a device initialization and the WDT overflow per-
forms a warm reset . By examining the TO and PDF
flags, the cause for a chip reset can be determined. The
PDFflagisclearedwhenthereisasystempower-uporby
executing the CLR WDT instruction and it is set when a
HALTinstructionisexecuted.TheTOflagissetiftheWDT
time-out occurs, and causes a wake-up that only resets
the program counter and SP, the others remain in their
original status.
The port A wake-up and interrupt methods can be con-
sidered as a continuation of normal execution. Each bit
in port A can be independently selected to wake-up the
devicebymaskoption.AwakeningfromanI/Oportstim-
ulus, the program will resume execution of the next in-
struction. If awakening from an interrupt, two sequences
may occur. If the related interrupts is disabled or the in-
terrupts is enabled but the stack is full, the program will
resume execution at the next instruction. If the interrupt
is enabled and the stack is not full, a regular interrupt re-
sponse takes place.
Once a wake-up event occurs, it takes 1024 t
SYS
(sys-
tem clock period) to resume to normal operation. In
other words, a dummy cycle period will be inserted after
the wake-up. If the wake-up results from an interrupt ac-
knowledge, the actual interrupt subroutine will be de-
layed by one more cycle. If the wake-up results in next
instruction execution, this will execute immediately after
a dummy period has finished. If an interrupt request flag
is set to
wake-upfunctionoftherelatedinterruptwillbedisabled.
1
before entering the HALT mode, the
To minimize power consumption, all I/O pins should be
carefully managed before entering the HALT status.
Reset
There are 3 ways in which a reset can occur:
RES reset during normal operation
RES reset during HALT
WDT time-out reset during normal operation
The WDT time-out during HALT is different from other
chip reset conditions, since it can perform a warm re -
set that just resets the program counter and SP, leaving
the other circuits to maintain their state. Some registers
remain unchanged during any other reset conditions.
Most registers are reset to the initial condition when
the reset conditions are met. By examining the PDF and
TO flags, the program can distinguish between different
chip resets .
TO
PDF
RESET Conditions
0
0
RES reset during power-up
u
u
RES reset during normal operation
0
1
RES wake-up HALT
1
u
WDT time-out during normal operation
1
1
WDT wake-up HALT
Note: u stands for unchanged
To guarantee that the system oscillator has started and
stabilized, the SST (System Start-up Timer) provides an
extra-delay of 1024 system clock pulses during system
power up or when the system awakes from a HALT
state.
When a system power-up occurs, the SST delay is
added during the reset period. But when the reset co-
mes from the RES pin, the SST delay is disabled. Any
wake-up from HALT will enable the SST delay.
The functional units chip reset status are shown below.
Program Counter
000H
Interrupt
Disable
Prescaler
Clear
WDT
Clear. After master reset,
WDT begins counting
Timer Counter (0/1)
Off
Input/output ports
Input mode
SP
Points to the top of stack
" !
$
# #
Reset Circuit
! ! 6
" !
$ # #
! ! 6 ) 6 :
;
)
Reset Timing Chart
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HT36A2 | 8-Bit Music Synthesizer MCU |
| HT36A3 | 8-Bit Music Synthesizer MCU |
| HT36A4 | 8-Bit Music Synthesizer MCU |
| HT3810 | 128 NOTE MELODY GENERATORS |
| HT3810A | 128 NOTE MELODY GENERATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT36A2 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit Music Synthesizer MCU |
| HT36A3 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit Music Synthesizer MCU |
| HT36A4 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Music Synthesizer 8-Bit MCU |
| HT36A4_07 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Music Synthesizer 8-Bit MCU |
| HT36ARP | 功能描述:兩端交流開關(guān)元件 32-40V RoHS:否 制造商:STMicroelectronics 轉(zhuǎn)折電流 VBO:45 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23 封裝:Reel |
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