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參數(shù)資料
| 型號(hào)： | HT47C20 |
| 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)： | 34/56頁 |
| 文件大?。?/td> | 352K |
| 代理商： | HT47C20 |
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HT47C20
34
January 18, 2000
Mask option
The following shows many kinds of mask options in the HT47C20. All these options should be defined
in order to ensure proper system functioning.
No.
Mask Option
1
OSC type selection. This option is to decide if an RC or a crystal oscillator is chosen as sys-
tem clock.
2
Clock source selection of WDT, RTC and Time Base. There are three types of selection: sys-
tem clock/4 or RTC OSC or WDT OSC.
3
WDT enable/disable selection. WDT can be enabled or disabled by mask option.
4
CLR WDT times selection. This option defines how to clear the WDT by instruction. One
time means that the CLR WDT can clear the WDT. Two times means that only if both
of the CLR WDT1 and CLR WDT2 have been executed, then WDT can be cleared.
5
Time Base time-out period selection. The Time Base time-out period ranges from f
s
/2
12
to
f
s
/2
15
. f
s
means the clock source selected by mask option.
6
Buzzer output frequency selection. There are eight types frequency signals for buzzer out-
put: f
s
/2
2
~f
s/29
. f
s
means the clock source selected by mask option.
7
Wake-up selection. This option defines the wake-up function activity. External I/O pins
(PAonly)allhavethecapabilitytowake-upthechipfromahaltmodebyafollowingedge.
8
Pull high selection. This option is to decide whether the pull high resistance is viable or not
on the low nibble of the PA.
9
PA CMOS or NMOS selection.
The structure of the low nibble of the PA can be selected to be CMOS or NMOS. When the
CMOS is selected, the related pins only can be used for output operations. When the NMOS
is selected, the related pins can be used for input or output operations.
10
I/O pins share with other function selection.
PA0/BZ, PA1/BZ: PA0 and PA1 can be set as I/O pins or buzzer outputs.
PA2/IR: PA2 can be set as I/O pins or IR carrier output.
PA3/PFD: PA3 can be set as I/O pins or PFD output.
11
LCD common selection. There are two types of selection: 3 commons (1/3 duty, 1/2 bias) or 4
commons (1/4 duty, 1/3 bias). If the 4 commons is selected, the segment output pin
SEG19/COM3 will be set as a common output COM3 .
12
LCD driver clock selection. There are seven types of frequency signals for the LCD driver
circuits: f
s
/2
2
~f
s
/2
8
. f
s
means the clock source selection by mask option.
13
LCD on or LCD off at the halt mode selection.
The LCD can be enable or disable at the halt mode by mask option.
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