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參數(shù)資料
| 型號： | MTU429B |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 4-Bit Micro-Controller with LCD Dr |
| 中文描述： | 4位微控制器與LCD博士 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 173K |
| 代理商： | MTU429B |
6/20
MTU429B Revision 3.0 28/Oct/1999
MTU429B
(Preliminary)
MYSON
TECHNOLOGY
rising edge, then will generate an interrupt) and use FREQ (internal frequency generator output) as clock
input, hence you can count the interval of CX.
To measure the resistor value of the temperature and humidity sensor, we must first measure the frequency of
Rref, then the frequency of sensor.
Here the Fref = K / Rref * CX
and Fsensor = K / Rsensor * CX,
hence Rsensor = Rref * Freq/ Fsensor.
4.5 Key_board Scanning Function
SEG11~26 shares the key_board scanning output, the output of the key_board scanning is a P open-drain to
VDDO (positive power supply) and all other SEGs and COMs are in Hi-z state during this period. This will min-
imize the effect of the LCD output.
The segment 11-26 also could be used as keyscan output and LCD still could be displayed with only slightly
affected.
SPK 00b5 b4 b3 b2 b1 b0.
b5: 1 will disable key-scan output.
b4: 1 will set all keyscan output as high, if b5=0.
b3~b0: will set the corresponding segment output as 1, if b5=0 and b4=0.
During power on, LCD off, STOP condition. All the common & segment output will be the chips supply power.
4.6 EL-Light
Set the ELC and ELP clock and duty cycle by ELC X instruction, then turn on and off the ELC and ELP output
by SF X and RF X instruction. With external transistor, diode, inductor and resistor, we can pump the EL-
panel to AC 100~250V.
While the light is turned on, the ELC will turn on before the ELP, but when the light is turned off, the ELP and
ELC will turn off after the next falling edge of the ELC to make sure no voltage is left on the EL- panel.
4.7 Timer
The 6-bit programmable timer can select PH3/PH9/PH15/FREQ (timer 2 can also select PH5/PH7/PH11/
PH13 by TM2X instruction) as the clock source. When it underflows, the HALT release signal is generated.
FIGURE 1. R to F Converter Diagram
ELP
ENX
EHM
FIN
ERR
Timer
&
R/F Controller
16-Bit Counter
Freq
Freq
CL
CL
LD
LD
ENX
FIN
4-Bit Data Bus
RT
RH
RR
CX
RTP
RHM
Rref
CX
TMS
PH9
MRF
Where K is a coefficient for RC-oscillation
and will bw a constant in a short time
period.
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