LM3S610_06 Datasheet, PDF (326/396 Pages) List of Unclassifed Manufacturers – Microcontroller

Inter-Integrated Circuit (I2C) Interface
Register 11: I²C Slave Control/Status (I2CSCSR), offset 0x004
This register accesses one control bit when written, and two status bits when read.
The read-only Status register consists of two bits: the RREQ bit and the TREQ bit. The Receive
Request (RREQ) bit indicates that the Stellaris I²C device has received a data byte from an I²C
master. Read one data byte from the I2C Slave Data (I2CSDR) register. The Transmit
Request (TREQ) bit indicates that the Stellaris I²C device is addressed as a Slave Transmitter.
Write one data byte into theI2C Slave Data (I2CSDR) register.
The write-only Control register consists of one bit: the DA bit. The DA bit enables and disables the
Stellaris I²C slave operation.
I2C Slave Status Register (I2CSCSR): Read
Offset 0x004
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
TREQ RREQ
Type
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
I2C Slave Control Register (I2CSCSR): Write
Offset 0x004
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
DA
Type
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
WO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
Name
Read-Only Status Register
31:2
reserved
1
TREQ
Type
Reset Description
RO
0
Reserved bits return an indeterminate value, and should
never be changed.
RO
0
This bit specifies the state of the I²C slave with regards to
outstanding transmit requests. If set, the I²C unit has been
addressed as a slave transmitter and uses clock
stretching to delay the master until data has been written
to the I2CSDR register. Otherwise, there is no outstanding
transmit request.
326
October 8, 2006
Preliminary