ST7556 Sitronix Technology, ST7556 Datasheet - Page 21

• Manufacturer Part Number: ST7556
• Description: 65 x 102 Dot Matrix LCD Controller/Driver
• Manufacturer: Sitronix Technology

ST7556
7. RESET CIRCUIT
Setting RESB to “ L ” or Reset instruction can initialize internal function.
When RESB becomes “ L ” , following procedure is executed
Page address: 0
Column address: 0
Oscillator: OFF
Power down mode (PD = 1)
Horizontal addressing (V = 0)
normal instruction set (H = 0)
Display OFF (D = E = 0)
Address counter X [6:0] = 0, Y [2:0] = 0
Bias system (BS [2:0] = 0)
VLCD is equal to 0; the HV generator is switched off (VOP [6:0] = 0)
After power-on, RAM data are undefined
While RESB is “ L ” or reset instruction is executed, no instruction except read status can be accepted. Reset status
appears at DB6. After DB6 becomes ” L ” , any instruction can be accepted. RESB must be connected to the reset pin of
the MPU, and initialize the MPU and this LSI at the same time. The initialization by RESB is essential before used.
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