ST7735
9.16 Reset Timing
Table 9.16.1 Reset timing
Related
Pins
Unit
Symbol
tRESW
tREST
Parameter
MIN
MAX
Reset pulse duration
Reset cancel
10
-
-
5
120
us
ms
ms
RESX
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
Longer than 9us
Between 5us and 9us
Reset Rejected
Reset
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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71
2009-12-04
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
