LPC2470FBD208,551 NXP Semiconductors, LPC2470FBD208,551 Datasheet - Page 267
![IC ARM7 MCU LCD 208-LQFP](/photos/12/13/121391/208-lqfp_sot459-1_pkg_sml.jpg)
LPC2470FBD208,551
Manufacturer Part Number
LPC2470FBD208,551
Description
IC ARM7 MCU LCD 208-LQFP
Manufacturer
NXP Semiconductors
Series
LPC2400r
Datasheets
1.OM11077.pdf
(792 pages)
2.LPC2470FET208551.pdf
(89 pages)
3.LPC2470FET208551.pdf
(91 pages)
Specifications of LPC2470FBD208,551
Package / Case
208-LQFP
Core Processor
ARM7
Core Size
16/32-Bit
Speed
72MHz
Connectivity
CAN, EBI/EMI, Ethernet, I²C, Microwire, MMC, SPI, SSI, SSP, UART/USART, USB OTG
Peripherals
Brown-out Detect/Reset, DMA, I²S, LCD, POR, PWM, WDT
Number Of I /o
160
Program Memory Type
ROMless
Ram Size
98K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 8x10b; D/A 1x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
LPC24
Core
ARM7TDMI-S
Data Bus Width
16 bit, 32 bit
Data Ram Size
98 KB
Interface Type
CAN/I2C/I2S/SPI/SSP/UART/USB
Maximum Clock Frequency
72 MHz
Number Of Programmable I/os
160
Number Of Timers
4
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
MDK-ARM, RL-ARM, ULINK2, MCB2470U
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
On-chip Dac
1-ch x 10-bit
Package
208LQFP
Device Core
ARM7TDMI-S
Family Name
LPC2000
Maximum Speed
72 MHz
Operating Supply Voltage
3.3 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
568-4361-5
935284068551
LPC2470FBD208-S
935284068551
LPC2470FBD208-S
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LPC2470FBD208,551
Manufacturer:
NXP Semiconductors
Quantity:
10 000
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NXP Semiconductors
UM10237_4
User manual
Fig 32. Transmit Flow Control
MirrorCounter
device driver
(1/515 bit
slots)
transmit
register
receive
(R)MII
(R)MII
writes
0
MirrorCounter
PauseTimer
TxFlowCtl
transmission
9.12 Half-Duplex mode backpressure
normal
50
Transmit flow control is enabled via the ‘TX FLOW CONTROL’ bit in the MAC1
configuration register. If the ‘TX FLOW CONTROL’ bit is zero, then the MAC will not
transmit pause control frames, software must not initiate pause frame transmissions, and
the TxFlowControl bit in the Command register should be zero.
Transmit flow control example
Figure 11–32
In this example, a frame is received while transmitting another frame (full duplex.) The
device driver detects that some buffer might overrun and enables the transmit flow control
by programming the PauseTimer and MirrorCounter fields of the FlowControlCounter
register, after which it enables the transmit flow control by setting the TxFlowControl bit in
the Command register.
As a response to the enabling of the flow control a pause control frame will be sent after
the currently transmitting frame has been transmitted. When the pause frame
transmission completes the internal mirror counter will start counting bit slots; as soon as
the counter reaches the value in the MirrorCounter field another pause frame is
transmitted. While counting the transmit datapath will continue normal transmissions.
As soon as software disables transmit flow control a zero pause control frame is
transmitted to resume the receive process.
When in half-duplex mode, backpressure can be generated to stall receive packets by
sending continuous preamble that basically jams any other transmissions on the Ethernet
medium. When the Ethernet block operates in half duplex mode, asserting
the TxFlowControl bit in the Command register will result in applying continuous preamble
on the Ethernet wire, effectively blocking traffic from any other Ethernet station on the
same segment.
normal receive
pause control
transmission
frame
100
illustrates the transmit flow control.
150
normal transimisson
Rev. 04 — 26 August 2009
200
250
pause in effect
pause control
transmission
frame
300
TxFlowCtl
clear
350
Chapter 11: LPC24XX Ethernet
pause control
transmission
frame
400
UM10237
© NXP B.V. 2009. All rights reserved.
normal receive
450
267 of 792
500
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