HD66710 Datasheet, PDF (28/73 Pages) Hitachi Semiconductor – (Dot Matrix Liquid Crystal Display Controller/Driver)

HD66710
Reset Function
Initializing by Internal Reset Circuit
An internal reset circuit automatically initializes the HD66710 when the power is turned on. 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 15 ms after V_CC rises to 4.5V or 40 ms after
the V_CC rises to 2.7V.
1. Display clear
2. Function set:
DL = 1; 8-bit interface data
N = 0; 1-line display
RE = 0; Extension register write disable
3. Display on/off control:
D = 0; Display off
C = 0; Cursor off
B = 0; Blinking off
BE = 0; CGRAM/SEGRAM blinking off
LP = 0; Not in low power mode
4. Entry mode set:
I/D = 1; Increment by 1
S = 0; No shift
5. Extension function set:
FW = 0; 5-dot character width
B/W = 0; Normal cursor (eighth line)
NW = 0; 1- or 2-line display (depending on N)
6. SEGRAM address set:
HDS = 000; No scroll
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 HD66710. For such a case, initialization must be performed by the MPU as
explained in the section, Initializing by Instruction.
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