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3.6 I2C Data Receive Register (ICDRR)
The I2C data receive register (ICDRR) is used to read the receive data. The ICDRR can receive a data
value of up to 8 bits; data values with fewer than 8 bits are right-aligned in the D bits and the remaining D
bits are undefined. The number of data bits is selected by the bit count bits (BC) of ICMDR. The I2C
receive shift register (ICRSR) shifts in the received data from the SDA pin. Once data is complete, the I2C
copies the contents of ICRSR into ICDRR. The CPU and the EDMA controller cannot access ICRSR.
The I2C data receive register (ICDRR) is shown in Figure 19 and described in Table 11.
Figure 19. I2C Data Receive Register (ICDRR)
31 16
Reserved
R-0
15 8 7 0
Reserved D
R-0 R-0
LEGEND: R = Read only; -n = value after reset
Table 11. I2C Data Receive Register (ICDRR) Field Descriptions
Bit Field Value Description
31-8 Reserved 0 These reserved bit locations are always read as zeros. A value written to this field has no effect.
7-0 D 0-FFh Receive data.
3.7 I2C Slave Address Register (ICSAR)
The I2C slave address register (ICSAR) contains a 7-bit or 10-bit slave address. When the I2C is not
using the free data format (FDF = 0 in ICMDR), it uses this address to initiate data transfers with a slave
or slaves. When the address is nonzero, the address is for a particular slave. When the address is 0, the
address is a general call to all slaves. If the 7-bit addressing mode is selected (XA = 0 in ICMDR), only
bits 6-0 of ICSAR are used; bits 9-7 are ignored. The I2C slave address register (ICSAR) is shown in
Figure 20 and described in Table 12.
Figure 20. I2C Slave Address Register (ICSAR)
31 16
Reserved
R-0
15 10 9 0
Reserved SADDR
R-0 R/W-3FFh
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 12. I2C Slave Address Register (ICSAR) Field Descriptions
Bit Field Value Description
31-10 Reserved 0 These reserved bit locations are always read as zeros. A value written to this field has no effect.
9-0 SADDR 0-3FFh Slave address. Provides the slave address of the I2C.
In 7-bit addressing mode (XA = 0 in ICMDR): bits 6-0 provide the 7-bit slave address that the I2C
transmits when it is in the master-transmitter mode. Bits 9-7 are ignored.
In 10-bit addressing mode (XA = 1 in ICMDR): Bits 9-0 provide the 10-bit slave address that the
I2C transmits when it is in the master-transmitter mode.
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Inter-Integrated Circuit (I2C) Peripheral SPRUEN0D–March 2011
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