Ht16C22 Operation Flow; Ht16C22 Initialization; Ht16C22 Data Read/Write; Ht16C22 Communication Method - Holtek HT16C22 Applications Manual

Electric Meter Applications Using the HT16C22
Note: When the DE and VE bits are in the following status, note the DA3~DA0 bit
setup.
DE VE
When V
LCD
be set to 0000.
0 0
When V
LCD
set to 0000.
The external MCU can detect the V
0 1
The bias voltage is provided by VDD in the HT16C22.
1 0 When the internal voltage-follower (OP3) is disabled, it is not
necessary to setup DA3~DA0.
1 1

HT16C22 Operation Flow

HT16C22 Initialization

When using the HT16C22, start with an initialization using the following steps:

Step 1: Enable the HT16C22 internal system clock

Step 2: Set the HT16C22 Internal LCD bias voltage

Step 3: Set the HT16C22 LCD frame frequency

Step 4: Set the HT16C22 VLCD and Seg reset pins

Step 5: Set the HT16C22 LCD blinking frequency

HT16C22 Data Read/Write

The HT16C22 data read/write setting steps are:

Step 1 : Set the corresponding address

Step 2 : Write operation to the display data RAM

Step 3 : Data display

HT16C22 Communication Method

The HT16C22 communicates with external devices using its I

2
Start and end I C communication signal
2
The I C communication Start signal (figure 1) and Stop signal (figure 2) are shown
below:
Special Notes
connects to VDD through a resistor, the DA3~DA0 bits must
directly connects to VDD, the DA3~DA0 bits must not be
LCD
------
3
voltage.
2
C interface.