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參數(shù)資料
| 型號： | HT49C10 |
| 廠商： | Holtek Semiconductor Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 17/47頁 |
| 文件大?。?/td> | 329K |
| 代理商： | HT49C10 |
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HT49C10
17
September 28, 1999
2
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Real time clock
All I/O ports maintain their original status.
The PD flag is set but the TO flag is cleared.
LCD driver is still running (if the WDT OSC
or RTC OSC is selected).
The system quits the HALT mode by an external
reset, an interrupt, an external falling edge sig-
nalonportA,oraWDToverflow.Anexternalre-
set causes device initialization, and the WDT
overflow performs a warm reset . After examin-
ing the TO and PD flags, the reason for chip re-
set can be determined. The PD flag is cleared by
system power-up or by executing the
WDT instruction, and is set by executing the
HALT instruction. On the other hand, the TO
flag is set if WDT time-out occurs, and causes a
wake-upthatonlyresetsthePC(ProgramCoun-
ter) and SP, and leaves the others at their origi-
nal state.
CLR
The port A wake-up and interrupt methods can
be considered as a continuation of normal exe-
cution. Each bit in port A can be independently
selected to wake up the device by mask option.
Awakening from an I/O port stimulus, the pro-
gram resumes execution of the next instruction.
On the other hand, awakening from an inter-
rupt, two sequences may occur. If the related in-
terrupt is disabled or the interrupt is enabled,
but the stack is full, the program resumes exe-
cution at the next instruction. But if the inter-
rupt is enabled, and the stack is not full, the
regular interrupt response takes place.
When an interrupt request flag is set before en-
tering the halt status, the system cannot be
awaken using that interrupt.
If a wake-up event occurs, it takes 1024 t
SYS
(system clock period) to resume normal opera-
tion. In other words, a dummy period is in-
serted. If the wake-up results from an interrupt
acknowledgment, the actual interrupt subrou-
tine execution is delayed by more than one cy-
cle. However, if the wake-up results in the next
instruction execution, the execution will be per-
formed immediately after the dummy period is
finished.
To minimize power consumption, all the I/O
pins should be carefully managed before enter-
ing the HALT status.
Reset
Therearethreewaysinwhicharesetmayoccur.
RES is reset during normal operation
RES is reset during HALT
WDTtime-outisresetduringnormaloperation
The WDT time-out during HALT differs from
other chip reset conditions, for it can perform a
warm reset that resets only the PC and SP
and leaves the other circuits at their original
state. Some registers remain unaffected during
any other reset conditions. Most registers are
reset to the initial condition once the reset
conditions are met. Examining the PD and TO
flags, the program can distinguish between dif-
ferent chip resets .
TO
PD
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 means unchanged
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HT49C30L | HDSP-A101 RED DISPLAY, LED, |
| HT49R30 | DISPLAY 7 SEGMENT |
| HT49R30A-1 | DISPL 7 SEG YELLOW |
| HT49C30-1 | 8-Bit LCD Type MCU |
| HT49C50 | 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT49C10(48SSOP) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| HT49C10-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type 8-Bit MCU |
| HT49C10-1_12 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type 8-Bit MCU |
| HT49C30-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit LCD Type MCU |
| HT49C30-1_12 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type 8-Bit MCU |
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