ST7735R
V0.2 74 2009-08-05
9.17 Reset Timing
Related Pins Symbol Parameter MIN MAX Unit
tRESW Reset pulse duration 10 - us
- 5 ms
RESX
tREST Reset cancel
120 ms
Table 9.17.1 Reset timing
Notes:
1. The reset cancel includes also required time for loading ID bytes, VCOM setting and other settings from NVM (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.
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