LPC1112FHN33/203,5 NXP Semiconductors, LPC1112FHN33/203,5 Datasheet - Page 214
LPC1112FHN33/203,5
Manufacturer Part Number
LPC1112FHN33/203,5
Description
ARM Microcontrollers - MCU Cortex-M0 16kB flash up to 4 kB SRAM
Manufacturer
NXP Semiconductors
Datasheet
1.LPC1113FHN333035.pdf
(538 pages)
Specifications of LPC1112FHN33/203,5
Rohs
yes
Core
ARM Cortex M0
Processor Series
LPC1112
Data Bus Width
32 bit
Maximum Clock Frequency
50 MHz
Program Memory Size
16 KB
Data Ram Size
4 KB
On-chip Adc
Yes
Operating Supply Voltage
1.8 V to 3.6 V
Operating Temperature Range
- 65 C to + 150 C
Package / Case
HVQFN-33
Mounting Style
SMD/SMT
Factory Pack Quantity
260
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NXP Semiconductors
UM10398
User manual
The UART master transmitter will identify an address character by setting the parity (9th)
bit to ‘1’. For data characters, the parity bit is set to ‘0’.
Each UART slave receiver can be assigned a unique address. The slave can be
programmed to either manually or automatically reject data following an address which is
not theirs.
RS-485/EIA-485 Normal Multidrop Mode (NMM)
Setting the RS485CTRL bit 0 enables this mode. In this mode, an address is detected
when a received byte causes the UART to set the parity error and generate an interrupt.
If the receiver is disabled (RS485CTRL bit 1 = ‘1’), any received data bytes will be ignored
and will not be stored in the RXFIFO. When an address byte is detected (parity bit = ‘1’) it
will be placed into the RXFIFO and an Rx Data Ready Interrupt will be generated. The
processor can then read the address byte and decide whether or not to enable the
receiver to accept the following data.
While the receiver is enabled (RS485CTRL bit 1 =’0’), all received bytes will be accepted
and stored in the RXFIFO regardless of whether they are data or address. When an
address character is received a parity error interrupt will be generated and the processor
can decide whether or not to disable the receiver.
RS-485/EIA-485 Auto Address Detection (AAD) mode
When both RS485CTRL register bits 0 (9-bit mode enable) and 2 (AAD mode enable) are
set, the UART is in auto address detect mode.
In this mode, the receiver will compare any address byte received (parity = ‘1’) to the 8-bit
value programmed into the RS485ADRMATCH register.
If the receiver is disabled (RS485CTRL bit 1 = ‘1’), any received byte will be discarded if it
is either a data byte OR an address byte which fails to match the RS485ADRMATCH
value.
When a matching address character is detected it will be pushed onto the RXFIFO along
with the parity bit, and the receiver will be automatically enabled (RS485CTRL bit 1 will be
cleared by hardware). The receiver will also generate an Rx Data Ready Interrupt.
While the receiver is enabled (RS485CTRL bit 1 = ‘0’), all bytes received will be accepted
and stored in the RXFIFO until an address byte which does not match the
RS485ADRMATCH value is received. When this occurs, the receiver will be automatically
disabled in hardware (RS485CTRL bit 1 will be set), The received non-matching address
character will not be stored in the RXFIFO.
RS-485/EIA-485 Auto Direction Control
RS485/EIA-485 mode includes the option of allowing the transmitter to automatically
control the state of the DIR pin as a direction control output signal.
Setting RS485CTRL bit 4 = ‘1’ enables this feature.
Direction control, if enabled, will use the RTS pin when RS485CTRL bit 3 = ‘0’. It will use
the DTR pin when RS485CTRL bit 3 = ‘1’.
All information provided in this document is subject to legal disclaimers.
Rev. 12 — 24 September 2012
Chapter 13: LPC111x/LPC11Cxx UART
UM10398
© NXP B.V. 2012. All rights reserved.
214 of 538
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