Texas Instruments AM335 Series Technical Reference Manual

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Table 21-33. I2C_SYSTEST Register Field Descriptions (continued)
Bit Field Type Reset Description
8 SCL_I_FUNC R 0h SCL line input value (functional mode).
This read-only bit returns the logical state taken by the SCL line
(either 1 or 0).
It is active both in functional and test mode.
Value after reset is low.
0x0 = Read 0 from SCL line
0x1 = Read 1 from SCL line
7 SCL_O_FUNC R 0h SCL line output value (functional mode).
This read-only bit returns the value driven by the module on the SCL
line (either 1 or 0).
It is active both in functional and test mode.
Value after reset is low.
0x0 = Driven 0 on SCL line
0x1 = Driven 1 on SCL line
6 SDA_I_FUNC R 0h SDA line input value (functional mode).
This read-only bit returns the logical state taken by the SDA line
(either 1 or 0).
It is active both in functional and test mode.
Value after reset is low.
0x0 = Read 0 from SDA line
0x1 = Read 1 from SDA line
5 SDA_O_FUNC R 0h SDA line output value (functional mode).
This read-only bit returns the value driven by the module on the SDA
line (either 1 or 0).
It is active both in functional and test mode.
Value after reset is low.
0x0 = Driven 0 to SDA line
0x1 = Driven 1 to SDA line
4 Reserved R 0h
3 SCL_I R 0h SCL line sense input value.
In normal functional mode (ST_EN = 0), this read-only bit always
reads 0.
In system test mode (ST_EN = 1 and TMODE = 11), this read-only
bit returns the logical state taken by the SCL line (either 1 or 0).
Value after reset is low.
0x0 = Read 0 from SCL line
0x1 = Read 1 from SCL line
2 SCL_O R 0h SCL line drive output value.
In normal functional mode (ST_EN = 0), this bit is don't care.
It always reads 0 and a write is ignored.
In system test mode (ST_EN = 1 and TMODE = 11), a 0 forces a
low level on the SCL line and a 1 puts the I2C output driver to a
high-impedance state.
Value after reset is low.
0x0 = Forces 0 on the SCL data line
0x1 = SCL output driver in high-impedance state
1 SDA_I R 0h SDA line sense input value.
In normal functional mode (ST_EN = 0), this read-only bit always
reads 0.
In system test mode (ST_EN = 1 and TMODE = 11), this read-only
bit returns the logical state taken by the SDA line (either 1 or 0).
Value after reset is low.
0x0 = Read 0 from SDA line
0x1 = Read 1 from SDA line
3759
SPRUH73H–October 2011–Revised April 2013 I2C
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Texas Instruments AM335 Series Specifications

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Brand	Texas Instruments
Model	AM335 Series
Category	Computer Hardware
Language	English