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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)： | 16/47頁 |
| 文件大小： | 329K |
| 代理商： | HT49C10 |
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HT49C10
16
September 28, 1999
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Time base
times selection option . If the CLR WDT is se-
lected (i.e., CLR WDT times equal one), any ex-
ecution of the CLR WDT instruction clears
the WDT. In the case that CLR WDT1 and
CLR WDT2 are chosen (i.e., CLR WDT times
equal two), these two instructions have to be ex-
ecuted to clear the WDT; otherwise, the WDT
may reset the chip because of time-out.
Multi-function timer
The HT49C10 provides a multi-function timer
for WDT, time base and RTC but with different
time-out periods. The multi-function timer con-
sists of a 7-stage divider and an 8-bit prescaler,
with the clock source coming from the WDT
OSC or RTC OSC or the instruction clock (i.e.,
system clock divided by 4). The multi-function
timer also provides a selectable frequency sig-
nal (ranges from fs/2
2
to fs/2
8
) for LCD driver
circuits, and a selectable frequency signal
(ranges from fs/2
2
to fs/2
9
) for buzzer output by
mask option. It is recommended to select a
4kHz signal for LCD driver circuits for proper
display.
Time base
The time base offers a periodic time-out period to
generate a regular internal interrupt. Its
time-out period ranges from fs/2
12
to fs/2
15
se-
lected by mask option. If time base time-out oc-
curs,therelatedinterruptrequestflag(TBF;bit4
of INTC1) is set. But if the interrupt is enabled,
and the stack is not full, a subroutine call to loca-
tion 10H occurs.
Real time clock
RTC
The real time clock (RTC) is operated in the
same manner as the time base that is used to
supply a regular internal interrupt. Its
time-out period ranges from fs/2
8
to fs/2
15
by
softwareprogramming(recommanduse2
12
~2
15
).
Writing data to RT2, RT1 and RT0 (bits 2, 1, 0 of
RTCC;09H) yields various time-out periods. If
theRTCtime-outoccurs,therelatedinterruptre-
quest flag (RTF; bit 5 of INTC1) is set. But if the
interrupt is enabled, and the stack is not full, a
subroutine call to location 14H occurs. The real
timeclocktime-outsignalcanalsobeappliedasa
clock source of the timer/event counter to get a
longer time-out period.
RT2
RT1
RT0
RTC Clock Divided
Factor
0
0
0
2
8
0
0
1
2
9
0
1
0
2
10
0
1
1
2
11
1
0
0
2
12
1
0
1
2
13
1
1
0
2
14
1
1
1
2
15
Power down operation
HALT
TheHALTmodeisinitializedbythe HALT in-
struction and results in the following.
The system oscillator turns off but the WDT
oscillator keeps running (if the WDT oscilla-
tor or the real time clock is selected).
The contents of the on-chip RAM and of the
registers remain unchanged.
The WDT is cleared and start recounting (if the
WDT clock source is from the WDT oscillator or
the real time clock oscillator).
相關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 |
相關代理商/技術參數(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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