UM10462 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2016. All rights reserved.
User manual Rev. 5.5 — 21 December 2016 306 of 523
NXP Semiconductors
UM10462
Chapter 14: LPC11U3x/2x/1x I2C-bus controller
When the slave address and data direction bit have been transmitted and an
acknowledge bit has been received, the SI bit is set, and the Status Register will show the
status code. For master mode, the possible status codes are 0x40, 0x48, or 0x38. For
slave mode, the possible status codes are 0x68, 0x78, or 0xB0. For details, refer to
Table 288
.
After a Repeated START condition, I
2
C may switch to the master transmitter mode.
14.9.3 Slave Receiver mode
In the slave receiver mode, data bytes are received from a master transmitter. To initialize
the slave receiver mode, write any of the Slave Address registers (ADR0-3) and write the
I
2
C Control Set register (CONSET) as shown in Table 284.
I2EN must be set to 1 to enable the I
2
C function. AA bit must be set to 1 to acknowledge
its own slave address or the General Call address. The STA, STO and SI bits are set to 0.
After ADR and CONSET are initialized, the I
2
C interface waits until it is addressed by its
own address or general address followed by the data direction bit. If the direction bit is 0
(W), it enters slave receiver mode. If the direction bit is 1 (R), it enters slave transmitter
Fig 45. Format of Master Receiver mode
Fig 46. A Master Receiver switches to Master Transmitter after sending Repeated START
DATA
A = Acknowledge (SDA low)
A = Not acknowledge (SDA high)
S = START condition
P = STOP condition
S SLAVE ADDRESS RW=1 A DATA P
n bytes data received
from Master to Slave
from Slave to Master
A
A
A = Acknowledge (SDA low)
A = Not acknowledge (SDA high)
S = START condition
P = STOP condition
SLA = Slave Address
Sr = Repeated START condition
DATA
n bytes data transmitted
From master to slave
From slave to master
A DATA A ASLA R Sr W PS SLA DATAAA
Table 284. CONSET used to configure Slave mode
Bit 7 6 5 4 3 2 1 0
Symbol - I2EN STA STO SI AA - -
Value- 10001- -
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