CodeWarrior for MCU中的主题 Memory Usage for MC9S08QB8 Device

Memory Usage for MC9S08QB8 Device

bpaehr — Tue, 09 Aug 2016 14:07:31 GMT

When I access the CodeWarrior Debugger, a Console Window named "<project>_Flash_PnE U-Multilink" opens which shows a bunch of "INF" lines. The following lines are part of that output:

INF: CMD>VC

INF: Verifying object file Checksum16+CRC8 to device ranges ...

INF: block 0000E000-0000E735 ...

INF: Ok.

INF: block 0000FFE6-0000FFE7 ...

INF: Ok.

INF: block 0000FFFE-0000FFFF ...

INF: Ok.

INF: Checksum Verification Successful. (Cumulative Checksum16+CRC8=$E1FEAC)

Do I assume that the E000-E735 is absolutely ALL of the Flash memory that my code occupies, and only two vectors for RESET and the TIMER that I defined for use are being written to the Flash memory? And that this is a quick way to determine how much Flash memory my code occupies?

In regards to the amount of RAM used, I found the following in the MAP file:

MODULE STATISTIC

Name Data Code Const

---------------------------------------------------------------------------------------------

Utilities_c.obj 44 472 0

main_c.obj 21 524 2

start08_c.obj 0 132 0

mc9s08qb8_c.obj 72 0 0

rtshc08.o (ansiis.lib) 0 697 0

other 64 16 7

The "Code" column totals add up to 0x0731, which seems to coincide with the reported E000-E735 range. Do I then assume that the Data column shows ALL of the RAM memory used by the project, for a total of 201 bytes? And how do the "Const" bytes (which I assume represent Constants) figure into memory usage?

I am using CW10.6.4 for an MC9S08QB8 device.

Thank you, in advance.

Re: Memory Usage for MC9S08QB8 Device

bpaehr — Tue, 09 Aug 2016 14:25:53 GMT

Looking further, I also found the following in the MAP file:

Summary of section sizes per section type:

READ_ONLY (R): 73A (dec: 1850)

READ_WRITE (R/W): 81 (dec: 129)

NO_INIT (N/I): 48 (dec: 72)

The "73A" is close to the Flash value range, and the 129 + 72 adds up to the same 201 value, so this section of the MAP file can be used as a double-check of the Flash and RAM usage?

Re: Memory Usage for MC9S08QB8 Device

ZhangJennie — Fri, 12 Aug 2016 04:16:42 GMT

Hi BOB,

yes. correct. "Summary of section sizes per section type:" section is the right place to check the memory usage.

Have a great day,
Jennie Zhang

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