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I2C Control Registers

30.6.20 I2C Data Output Register (I2CDOUT)

This register contains the values sent to the I2C pins. Figure 30-33 and Table 30-29 describe this register.

Figure 30-33. I2C Data Output Register (I2CDOUT) [offset 0x54]

15 2 1 0

Reserved SDAOUT SCLOUT

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

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

Table 30-29. I2C Data Output Register (I2CDOUT) Field Descriptions

Bit Field Value Description

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

1 SDAOUT SDA Data Output

This function is only active if the SDA pin is configured as an I/O pin with PINFUNC = 1. This bit

contains the value sent to the SDA pin.

0 The pin is driven low.

1 The pin is driven high.

0 SCLOUT SCL Data Output

This function is only active if the SCL pin is configured as an I/O pin with PINFUNC = 1. This bit

contains the value sent to the SCL pin.

0 The pin is driven low.

1 The pin is driven high.

30.6.21 I2C Data Set Register (I2CDSET)

The I2CDSET register is an alias of the I2CDOUT register. When written to at this address, writing a 1 to

a bit sets the corresponding bit in I2CDOUT to a 1, while writing a 0 leaves it unchanged. Figure 30-34

and Table 30-30 describe this register.

Figure 30-34. I2C Data Set Register (I2CDSET) [offset = 58h]

15 2 1 0

Reserved SDASET SCLSET

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

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

Table 30-30. I2C Data Set Register (I2CDSET) Field Description

Bit Field Value Description

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

1 SDASET Serial Data Set

This bit is used to set the SDA GPIO pin.

0 Read: Reads return value of SDAOUT.

Write: No effect.

1 Read: Reads return value of SDAOUT.

Write: SDAOUT is set to logic high (1).

0 SCLSET Serial Clock Set

This bit is used to set the SCL GPIO pin.

0 Read: Reads return value of SCLOUT.

Write: No effect.

1 Read: Reads return value of SCLOUT.

Write: SCLOUT is set to logic high (1).

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

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