ST7735 datasheet(71/166 Pages) SITRONIX

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ST7735

V1.7

2009-12-04

9.16 Reset Timing

Table 9.16.1 Reset timing

Pins

Symbol

Parameter

MIN

MAX

Unit

tRESW

Reset pulse duration

RESX

tREST

Reset cancel

120

Notes:

1. The reset cancel includes also required time for loading ID bytes, VCOM setting and other settings from EEPROM (or

similar device) to registers. This loading is done every time when there is HW reset cancel time (tRT) within 5 ms after a

rising edge of RESX.

2. Spike due to an electrostatic discharge on RESX line does not cause irregular system reset according to the table below:

RESX Pulse

Action

Shorter than 5us

Reset Rejected

Longer than 9us

Reset

Between 5us and 9us

Reset starts

3. During the Resetting period, the display will be blanked (The display is entering blanking sequence, which maximum

time is 120 ms, when Reset Starts in Sleep Out –mode. The display remains the blank state in Sleep In -mode.) and then

return to Default condition for Hardware Reset.

4. Spike Rejection also applies during a valid reset pulse as shown below:

5. When Reset applied during Sleep In Mode.

6. When Reset applied during Sleep Out Mode.

7. It is necessary to wait 5msec after releasing RESX before sending commands. Also Sleep Out command cannot be sent

for 120msec.

ST7735 Datasheet(PDF) 71 Page - Sitronix Technology Co., Ltd.