INTRODUCTION TO LPC2138 ARCHITECTURE

In this section we will start programming LPC2138 with the brief introduction we had in the previous section. As described earlier in order to start programming LPC 2138 programming, we will start with the architecture of LPC 2138 first and then proceed with the GPIO pins.

               Here, let me remind you one thing as I said one need to have a good knowledge on seeing the data sheet for programming any controller. So in order to verify the more details on LPC2138 please click on the following link. However the things needed during programming will be covered using snapshots.

http://www.nxp.com/documents/data_sheet/LPC2131_32_34_36_38.pdf

To start programming being from user level please refer the following link for user manual of LPC2138

http://www.nxp.com/documents/user_manual/UM10120.pdf

The following is the pin diagram of LPC2138:

As we seen in the pin diagram LPC 2138 is a 64 pin IC. In most of the pins each one has multiple functionalities. In here we are going discuss every feature in the 

The following are the minimum requirements to boot up (startup) an ARM7 LPC2138 controller.

The power pins

Oscillator configurations

Power pins:

               LPC 2138 has the following pins in relation with the power supply

V ref (63)    - REFERENCE FOR ADC CONTROL (NORMALLY AS SAME AS THE VBAT EXCEPT WHEN CONTROL NEEDED)

VSSA (59)   - ANALOG GROUND

VDD (51)    - 3.3 V POWER SUPPLY

VssA (50)   - ANALOG GROUND

VBAT (49)   - SUPPLY FOR RTC (3.3V)

VSS (43)     -   0V REFERENCE

Vdd (42)    -   3.3 V POEWR SUPPLY

VSS( 25)    -    0V REF

VDD (23)   -     3.3V POWER SUPPLY

VSS (18)   -     0V REF

 The no of power supplies are more in order provide isolation between the different modules like ADC ,RTC, etc.

To avoid ambiguity of connecting these power supplies to boot up the controller, we will use a easy way by which the power supply complexity is minimized. To refer this check the following figure. In order to provide a power supply by considering the all power supplies we will simply connect the all power pind like below. 

                                                       Fig:   Booting LPC2138

Oscillator configurations:

                                             For the instance as the keil is capable of providing the oscillator frequency required and proteus also provide the facility to follow the prescribed frequency written in the keil compiler we will not bother about the frequency of frequency, however we will discuss them when we realizing the circuit with hardware .

The listed above are the minimum requirement for the booting up of micro controller.