OM13013,598 NXP Semiconductors, OM13013,598 Datasheet - Page 197
OM13013,598
Manufacturer Part Number
OM13013,598
Description
BOARD DEMO IAR LPC1227 JLINKLITE
Manufacturer
NXP Semiconductors
Series
-r
Specifications of OM13013,598
Design Resources
LPC122x-SK Brd Schematic
Processor To Be Evaluated
LPC1227
Processor Series
LPC122x
Data Bus Width
32 bit
Interface Type
UART, SSP, SPI, I2C
Cpu Core
ARM Cortex-M0
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Operating Supply Voltage
3 V to 3.6 V
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
568-6885
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UM10441
User manual
11.9.7 Serial clock generator
The synchronization logic will synchronize the serial clock generator with the clock pulses
on the SCL line from another device. If two or more master devices generate clock pulses,
the “mark” duration is determined by the device that generates the shortest “marks,” and
the “space” duration is determined by the device that generates the longest “spaces”.
Figure 21
A slave may stretch the space duration to slow down the bus master. The space duration
may also be stretched for handshaking purposes. This can be done after each bit or after
a complete byte transfer. the I
been transmitted or received and the acknowledge bit has been transferred. The serial
interrupt flag (SI) is set, and the stretching continues until the serial interrupt flag is
cleared.
This programmable clock pulse generator provides the SCL clock pulses when the I
block is in the master transmitter or master receiver mode. It is switched off when the I
block is in a slave mode. The I
Fig 20. Arbitration procedure
Fig 21. Serial clock synchronization
(1) Another device transmits serial data.
(2) Another device overrules a logic (dotted line) transmitted this I
(3) This I
(1) Another device pulls the SCL line low before this I
(2) Another device continues to pull the SCL line low after this I
(3) The SCL line is released , and the clock generator begins timing the HIGH time.
low. Arbitration is lost, and this I
transmitted. This I
the new master once it has won arbitration.
device effectively determines the (shorter) HIGH period.
released SCL. The I
effectively determines the (longer) LOW period.
SDA line
SCL line
shows the synchronization procedure.
SDA line
SCL line
2
C is in Slave Receiver mode but still generates clock pulses until the current byte has been
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 15 February 2011
2
C will not generate clock pulses for the next byte. Data on SDA originates from
2
C clock generator is forced to wait until SCL goes HIGH. The other device
(1)
1
period
high
2
C block will stretch the SCL space duration after a byte has
2
C output clock frequency and duty cycle is programmable
(1)
(1)
2
2
C enters Slave Receiver mode.
period
low
(2)
3
(2)
(3)
Chapter 11: LPC122x I2C-bus controller
4
2
C has timed a complete high time. The other
(1)
2
C has timed a complete low time and
(3)
2
C master by pulling the SDA line
8
UM10441
© NXP B.V. 2011. All rights reserved.
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