參數(shù)資料
型號(hào)： LPC2939FBD208
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 微控制器/微處理器
英文描述： ARM9 microcontroller with CAN, LIN, and USB
中文描述： 32-BIT, FLASH, 125 MHz, RISC MICROCONTROLLER, PQFP208
封裝： 28 X 28 MM, 1.40 MM HEIGHT, PLASTIC, SOT-459, MS-026, LQFP-208
文件頁(yè)數(shù)： 18/99頁(yè)
文件大小： 1945K
代理商： LPC2939FBD208
LPC2939_3
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 03 — 7 April 2010
18 of 99
NXP Semiconductors
LPC2939
ARM9 microcontroller with CAN, LIN, and USB
6.6.3.1
ETM/ETB
The ETM provides real-time trace capability for deeply embedded processor cores. It
outputs information about processor execution to a trace buffer. A software debugger
allows configuration of the ETM using a JTAG interface and displays the trace information
that has been captured in a format that a user can easily understand. The ETB stores
trace data produced by the ETM.
The ETM/ETB module has the following features:
Closely tracks the instructions that the ARM core is executing
On-chip trace data storage (ETB)
All registers are programmed through JTAG interface
Does not consume power when trace is not being used
THUMB/Java instruction set support
6.6.4
Power supply pins
Table 6
shows the power supply pins.
Table 6.
Symbol
V
DD(CORE)
V
SS(CORE)
V
DD(IO)
V
SS(IO)
V
DD(OSC_PLL)
V
SS(OSC)
V
SS(PLL)
V
DDA(ADC3V3)
V
DDA(ADC5V0)
6.7 Clocking strategy
6.7.1
Clock architecture
The LPC2939 contains several different internal clock areas. Peripherals like Timers, SPI,
UART, CAN and LIN have their own individual clock sources called base clocks. All base
clocks are generated by the Clock Generator Unit (CGU0). They may be unrelated in
frequency and phase and can have different clock sources within the CGU.
The system clock for the CPU and AHB Bus infrastructure has its own base clock. This
means most peripherals are clocked independently from the system clock. See
Figure 4
for an overview of the clock areas within the device.
Within each clock area there may be multiple branch clocks, which offers very flexible
control for power-management purposes. All branch clocks are outputs of the Power
Management Unit (PMU) and can be controlled independently. Branch clocks derived
from the same base clock are synchronous in frequency and phase. See
Section 6.16
for
more details of clock and power control within the device.
Power supply pins
Description
digital core supply 1.8 V
digital core ground (digital core, ADC0/1/2)
I/O pins supply 3.3 V
I/O pins ground
oscillator and PLL supply
oscillator ground
PLL ground
ADC1 and ADC2 3.3 V supply
ADC0 5.0 V supply
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