ssd1800 ETC-unknow, ssd1800 Datasheet - Page 23

• Manufacturer Part Number: ssd1800
• Description: 80x16 + 1 Icon Line Lcd Segment / Common Driver With Controller For Character Display System
• Manufacturer: ETC-unknow

8.13 Reset Circuit
function. Once RES receives a negative reset pulse, all internal circuitry will start to initialize. Minimum pulse width
for completing the reset sequence is 10ms.
The status of the chip after reset is given by:
8.14 Display Data Latch
holding the data, which will be fed to the HV Buffer Cell and Level Selector to output the required voltage levels.
8.15 Level Selector
used with different cycles. Synchronization is important since it selects the required LCD voltage level to the HV
Buffer Cell, which in turn outputs the COM or SEG LCD waveform.
8.16 HV Buffer Cell (Level Shifter)
The output is shifted out with an internal FRM clock that comes from the Display Timing Generator. The voltage
levels are given by the level selector that is synchronized with the internal M signal.
SSD1800 Series
This block includes Power On Reset circuitry and the Reset pin RES . Both of these having the same reset
1. Display/ cursor/ blink is turned OFF
2. 2-line display mode
3. Power control register is set to 000b
4. Oscillator is OFF
5. Power save is OFF
6. CGRAM is not used
7. Shift register data clear in serial interface
8. Bias ratio is set to 1/5
9. Address counter is set to 00h
10. Normal scan direction of the COM outputs
11. Contrast control register is set to 00h
12. Test mode is turned OFF
13. In case of 4-bit interface mode selection, SSD1800 considers the 1st 4-bit data from MPU as the
14. The 1st line of display is the address 00h-0Fh.
A series of registers carrying the display signal information. For SSD1800, there are 105 latches (80 + 25) for
Level Selector is a control of the display synchronization. Display voltage can be separated into two sets and
Buffer Cell work as a level shifter, which translates the low voltage output signal to the required, driving voltage.
high order bits.
Rev 1.0
P 23/42 Mar 2004
Solomon Systech