FAQ

How to view code size and SRAM usage in the Keil development environment? Issue Date：2015-07-09

After programming, Keil will display the following message:

Program Size: Code=86496 RO-data=9064 RW-data=1452 ZI-data=16116

The parameters have the following meanings:

Code	The space occupied by the code.
RO-data	The read-only constant, e.g. const.
RW-data (Read Write)	The initialized read-write variables.
ZI-data (Zero Initialize)	The uninitialized read-write variables. ZI-data is not regarded as code because it is not initialized.

Note: The unit is Byte.

When programming, the occupied space in Flash is: Code+(RO-data)+(RW-data)

When a program is running, the space used for the internal SRAM inside the chip is: (RW-data)+(ZI-data)

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