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I2C Control Registers

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30.6.22 I2C Data Clear Register (I2CDCLR)

The I2CDCLR register is an alias of the I2CDOUT register. When written to at this address, writing a 1 to

a bit clears the corresponding bit in I2CDOUT to a 0, while writing a 0 leaves it unchanged. Figure 30-35

and Table 30-31 describe this register.

Figure 30-35. I2C Data Clear Register (I2CDCLR) [offset = 5Ch]

15 2 1 0

Reserved SDACLR SCLCLR

R-0 R/W-0 R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 30-31. I2C Data Clear Register (I2CDSET) Field Descriptions

Bit Field Value Description

15-2 Reserved 0 Read returns 0. Writes have no effect.

1 SDACLR Serial Data Clear

This bit is used to clear the SDA GPIO pin.

0 Read: Reads return value of SDAOUT.

Write: No effect.

1 Read: Reads return value of SDAOUT.

Write: SDAOUT is cleared to logic low.

0 SCLCLR Serial Clock Clear

This bit is used to clear the SCL GPIO pin.

0 Read: Reads return value of SCLOUT.

Write: No effect.

1 Read: Reads return value of SCLOUT.

Write: SCLOUT is cleared to logic low.

30.6.23 I2C Pin Open Drain Register (I2CPDR)

A value of 1 in the I2CPDR register configures the corresponding pin for open drain capability. A value of

0 disables this open drain capability of the pin. Figure 30-36 and Table 30-32 describe this register.

Figure 30-36. I2C Pin Open Drain Register (I2CPDR) [offset = 60h]

15 2 1 0

Reserved SDAPDR SCLPDR

R-0 R/W-0 R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 30-32. I2C Pin Open Drain Register (I2CPDR) Field Descriptions

Bit Field Value Description

15-2 Reserved 0 Read returns 0. Writes have no effect.

1 SDAPDR SDA pin open drain enable

0 The open drain function is disabled (the output voltage is V

or lower if SDAOUT = 0 and high-

impedance if SDAOUT = 1)

1 The open drain function is enabled (output voltage is V

or lower if SDAOUT = 0; V

or higher if

SDAOUT = 1)

0 SCLPDR SCL pin open drain enable

0 The open drain function is disabled (the output voltage is V

or lower if SCLOUT = 0 and high-

impedance if SCLOUT = 1)

1 The open drain function is enabled (output voltage is V

or lower if SCLOUT = 0; V

or higher if

SCLOUT = 1)

1520

Inter-Integrated Circuit (I2C) Module SPNU562–May 2014

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