ST7070 View Datasheet(PDF) - Sitronix Technology Co., Ltd.
Part Name
Description
MFG CO.
'ST7070' PDF : 51 Pages View PDF
ST7070
Reset Function
Initializing by Internal Reset Circuit
An internal reset circuit automatically initializes the ST7070 when the power is turned on or hardware reset pin
has low. The following instructions are executed during the initialization. The busy flag (BF) is kept in the busy
state until the initialization ends (BF = 1). The busy state lasts for 40 ms after VCC rises to 4.5 V.
1. Display clear
2. Function set:
DL = 1; 8-bit interface data
N = 1; 2-line display
EXT=0;disable extension instruction.
3. Display on/off control:
D = 0; Display off
C = 0; Cursor off
P = 0; Page 1 of font table(DDRAM data b8=0)
4. Entry mode set:
I/D = 1; Increment by 1
S = 0; No shift
5. Bias resistor select:
Rb1=0;Rb2=0 select external bias resistor.
6. COM、SEG direction select:
C1=0;C2=0;S1=0;S2=0 not reverse.
Note:
If the electrical characteristics conditions listed under the table Power Supply Conditions Using
Internal Reset Circuit are not met, the internal reset circuit will not operate normally and will fail
to initialize the ST7070. For such a case, initialization must be performed by the MPU as
explain by the following figure.
V1.4
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2009/04/29
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