CX51: USING ECRM MODE ON PHILIPS MX2

Information in this article applies to:

• C51 Version 7.11 or higher

QUESTION

Is the ECRM (Extended Call/Ret Mode) supported by Keil CX51 and the µVision Simulator?

ANSWER

Yes, this new mode is fully supported by the tools. To enable ECRM Mode you need to:

1. Use the START_MX.A51 file version 1.03 or higher and enable the ECRM setting.
2. Set Code Rom Size: "Huge: 8MB Program" under Options - Target.
3. Set Linker Code Packing (max. AJMP/ACALL) under Options - CX51.

The LX51 Linker/Locater inserts RET instead of ERET and optimizes the ECALL instructions to ACALL or LCALL wherever possible.

Note that the ECRM Mode is currently available only on 8xC51MB2/MC2 devices.

SEE ALSO

• LX51: WARNING L43 USING SRC MODE WITH PHILIPS MX
• Application Note 160: Programming the Philips 51MX Architecture with the Keil PK51
• C51: EXAMPLE PROGRAMS FOR THE PHILIPS MX DEVICES

Last Reviewed: Monday, May 03, 2004