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STMPE811 Datasheet(PDF) 16 Page - STMicroelectronics

Part # STMPE811
Description  Advanced resistive touch screen controller with 8-bit GPIO expander
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE811 Datasheet(HTML) 16 Page - STMicroelectronics

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SPI interface
STMPE811
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Doc ID 14489 Rev 2
5.2
SPI timing modes
The SPI timing modes are defined by CPHA and CPOL,CPHA and CPOL are read from the
"SDAT" and "A0" pins during power-up reset. The following four modes are defined
according to this setting.
The clocking diagrams of these modes are shown in ON reset. The device always operates
in mode 0. Once the bits are set in the SPICON register, the mode change takes effect on
the next transaction defined by the CS_n pin being deasserted and asserted.
5.2.1
SPI timing definition
Table 9.
SPI timing modes
CPOL_N (SDAT pin)
CPOL
CPHA (ADDR pin)
Mode
100
0
101
1
010
2
011
3
Table 10.
SPI timing specification
Symbol
Description
Timing
Unit
Min
Typ
Max
tCSS
CS_n falling to
first capture
clock
1
−−
µs
tCL
Clock low
period
500
−−
ns
tCH
Clock high
period
500
−−
ns
tLDI
Launch clock
to MOSI data
valid
−−
20
ns
tLDO
Launch clock
to MISO data
valid
−−
330
µs
tDI
Data on MOSI
valid
1
−−
µs
tCCS
Last clock
edge to CS_n
high
1
−−
µs
tCSH
CS_n high
period
2
−−
µs


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