ATMEL AVR ASSEMBLER AT90S系列源程序编译软件，内带大量源代码

AVR Development Tools version 1.21 Welcome to the AVR Development Tools version 1.21. The simulator has not been updated and will not be updated in the future. AVR Studio is the recommended software for simulation of AVR devices. The simulator in this package is only intended for Windows 3.1x users as AVR Studio requires Windows 95 or Windows NT. AVR Studio is available at the Atmel Web (www.atmel.com). The changes in the Assembler are as follows: Version 1.21: 1) There has been some problems with the Windows version of the AVR Assembler and some Windows 95 versions. The program generates a General Protection Fault when restarting the Assembler if all windows were not closed before exit on the previous execution. Users who experience this problem should enable the option "Close all windows before exit" to avoid the problem. 2) There was a problem with the bitwise not operator. The error message "Overflow in arithmetic operation" was often incorrectly generated when this operator was used. This problem has been fixed. 3) The problem with erronous intel-hex files caused by the device directive has been fixed. 4) Labels can now correctly be used in .db directives. Version 1.20: 1) Macros which were referred before they were defined resulted in incorrect code. This situation will now generate an error message. 2) In the Data Segment (dseg) the location counter started at 0x20. This has been changed to 0x60 3) The Windows version of the assembler does not support files larger than 30K. If this situation occurs, the situation will now be flagged. Workarounds: use the include directive or use an external editor and the command line version of the Assembler. 4) The Windows Assembler will not enter Insert mode when Shift+Ins or Ctrl+Ins are pressed. 5) The Windows Assembler has had problems with special versions of Windows 95 during startup. Version 1.20 avoids this problem. 6) The warning message when using LDS/STS instruction together with a .device at90s2313 is removed. 7) New devices are added: AT90S2323, AT90S2343 and ATMEGA103 8) .db and .dw directives can be used within a macro 9) ASCII literals are supported: ldi r16,'A' 10) ASCII strings are supported: .db "String" ASCII strings will not be zero terminated. 11) The .dw directive had a problem when used in the EEPROM segment (eseg). This has been corrected. 12) Calling macros from within another macro is not supported. Version 1.20 will issue an error message when this is done.