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HS I
2
C Functional Description
NOTE:
Each HS I
2
C controller can be used with an internal secondary pullup. This pullup is
mandatory when the I
2
C controller is configured in HS mode for a bit rate of 3.4Mbps, and
the bus line capacitance exceeds 45 pF. Pullups can be programmed through the
CONTROL.CONTROL_PROG_IO1[19] PRG_I2C1_PULLUPRESX bit for I2C1, the
CONTROL.CONTROL_PROG_IO1[0] PRG_I2C2_PULLUPRESX bit for I2C2, and the
CONTROL.CONTROL_PROG_IO2[7] PRG_I2C3_PULLUPRESXbit for I2C3.
The maximum bit rate specified by the SCCB specifications is 100Kbps.
17.4.8 HS I
2
C Noise Filter
The noise filter is used to suppress any noise that is 50 ns or less in case of F/S and SCCB operation
modes, and any noise that is 10 ns or less in case of HS mode operation. The noise filter is always one
period of the I2Ci_INTERNAL_CLK clock. This way, for HS mode operation (prescaler bypassed), the filter
suppresses spikes of less than 10.4 ns.
For SCCB modes (for example, the I2Ci.
[7:0] PSC bit field = 4), the maximum width of
suppressed spikes is 52 ns.
To ensure correct filtering, the prescaler must be programmed accordingly by the 2Ci.
[7:0] PSC
bit field.
17.4.9 HS I
2
C System Test Mode
A system test mode is available for the HS I
2
C controller module testing. This mode is enabled by setting
the I2Ci.
[15] ST_EN to 1. When this bit is cleared to 0, the I
2
C controller is configured in
normal operation mode.
In system test mode, the I2Ci_SYSTEST[13:12] TMODE bit field selects the type of test.
lists
the tests available for the HS I
2
C controllers.
Table 17-13. HS I
2
C List of tests for the HS I
2
C Controllers
I2Ci.
[13:12 Test
Description
] TMODE Bit Field Value
b00
Functional mode
Normal operation mode
b01
Reserved (not used)
b10
Test of i2ci_scl serial
The i2ci_scl line is driven with a permanent clock as if mastered with the
clock line
parameters set in the I2Ci.
, and I2Ci.
registers.
b11
Loop-back mode +
In the master transmit mode only, data transmitted out of the
i2ci_scl/ i2ci_sda/
I2Ci.
register (write action) is received in the same
i2ci_sccbe input/output
I2Ci.
register through an internal path through the FIFO buffers.
The DMA and interrupt requests are normally generated if they are
enabled. Moreover, the i2ci_scl, i2ci_sda, and i2ci_sccbe lines are
controlled with the I2Ci.
[4:0] bits.
NOTE:
When the I2Ci.
[13:12] TMODE bit field = b11, the I
2
C controller must be
configured in I
2
C F/S mode (I2Ci.
[13:12] OPMODE = b00) or I
2
C HS mode
(I2Ci.
[13:12] OPMODE = b01). The loop-back mode is not available in SCCB mode
(I2Ci.
[13:12] OPMODE = b10).
NOTE:
In normal operation mode (I2Ci.
[15] ST_EN clear to 0), the
I2Ci.
[4:0] bits that control the i2ci_scl, i2ci_sda, and i2ci_sccbe lines in system
test mode are read-only bits.
In system test mode (the I2Ci.
[15] ST_EN bit set to 1), the I2Ci.
[5:0] status bits
2797
SWPU177N – December 2009 – Revised November 2010
Multimaster High-Speed I
2
C Controller
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
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