Instruction Manual

UG_6612_036 78M6612 M-API Library User Guide
Rev. 1.00 11
3.2.2 RAM/Data Memory
The 78M6612 has 2K bytes of Data Memory for exclusive use by the embedded 80515 MPU library and
application layers. In addition, there are 512 bytes reserved for the Compute Engine.
Table 3: Data RAM Shared by CE and MPU
Address (hex) Type Typical Usage Size (bytes)
0000-07FF Volatile MPU data XRAM, 2KB
1000-11FF Volatile CE data 512
2000-20FF Volatile
Miscellaneous I/O RAM
(configuration RAM)
256
3.3 Build Configuration
The accompanying example application source code has been set up to link to each library under specific
hardware configuration. Each configuration is defined under a different ‘Target’. However, for all ‘Targets’,
specific area of Flash is reserved for specific function as described below.
3.3.1 Flash/Code and RAM Size
The attached zipped file (78M6612MAPIv200.zip) contains a sample Application code, of which source
code is also included. The functions of this application are detailed in Section 6.
This sample application is taking up Flash/RAM usage according to the table below. It was written to
demonstrate the use of the MAPI libraries via two types of commands: the ‘M’ commands (as shown in
Section 6) to specifically address the MAPI calls; and the ‘CLI’, aka Command Line Interface, commands
for backward compatibility to support those who have evaluated, or are familiar with, Teridian OMU
products in the past.
The following tables show RAM and Flash consumptions by this sample application. They also show a
breakdown of Flash consumption by different features as implemented in the MAPI libraries.
Table 4: Flash and RAM Consumption by MAPI and Sample Application
Firmware Module
RAM
Used
Flash Used Note
6612S22_WB_MAPI.lib
6612S22_NB_MAPI.lib
~ 26K The RAM usage is overlay-able. See the
breakdown of Flash usage in Table 5.
6612IVIV_50F0_v200WB.hex
6612IVIV_50F0_v200NB.hex
1.7K 6K + 26K(lib) The app from this build uses every single API
library call.
Table 5: Breakdown of M-API’s Flash Consumption
Library:
6612S22_WB_MAPI.lib
6612S22_NB_MAPI.lib
Flash Used Features
Calibration 5.7K Includes calibration for: Temperature, Current, Voltage,
Watt and Phase.
Initialization, Default Settings 5.8K Initializes Defaults, Metering Constants Tables,
Registers, etc.
MAPI Interface (to App) 1.5K Direct interface to the library from application.
Flash Manager 2K Flash Read/Write management.