|
||
| Products Download Events Support Videos | ||
Technical Support
Support Resources
- Support Knowledgebase
- Product Manuals
- Application Notes
- Downloads
- Product Updates
- Discussion Forum
- Books
Product Information
What's New in C51 Version 9.56
C51 Version 9.56 Release
Release Date: 8th August 2016
-
[Cx51 Compiler]
- Improved C90 conformity for ASSERT.H, FLOAT.H, MATH.H, STDARG.H, STDDEF.H, STDLIB.H, and STRING.H header files.
-
Corrected: reduntant code genration. Under some
circumstances the C51 compiler generates code which loads the
accumulator register A twice. Example:
........ 10: 11: union X { 12: struct { 13: unsigned char l8 :8; 14: } v; 15: }; 16: 17: union X xdata x _at_ 0x5800; 18: unsigned char t; 19: 20: void MyFunc(void) { 21: x.v.l8 = t; 22: } 23: ........ 21: x.v.l8 = t; C:0x088C 90581D MOV DPTR,#0x581D -------+------o Suboptimal code generation C:0x088F E0 MOVX A,@DPTR | <---- Superfluous register A load C:0x0890 ED MOV A,R5 | C:0x0891 F0 MOVX @DPTR,A -------+ 21: x.v.l8 = t; C:0x13BA 90581D MOV DPTR,#0x581D -------+------o Corrected code generation C:0x13BD ED MOV A,R5 | C:0x13BE F0 MOVX @DPTR,A -------+ -
Corrected: wrong code generation in case of bit-field
computation inside a switch-case statement. Example:
#include <REG51F.H> typedef struct sTest { unsigned char b1 : 1; unsigned char b2 : 1; } t_test; xdata t_test tSt; void main (void) { switch (tSt.b2) { case 1: P1 = 1; break; default: P1 = 0; break; } +----------------------------- Wrong code generation +----------------------------- ; FUNCTION main (BEGIN) ; SOURCE LINE # 10 ; SOURCE LINE # 12 0000 900000 R MOV DPTR,#tSt 0003 E0 MOVX A,@DPTR 0004 5402 ANL A,#02H -----------\ 0006 14 DEC A +---- The compiler erroneously generates code which evaluates 0007 7004 JNZ ?C0003 -----------/ the bit position 0 instead the bit position 1. | | +----------------------------- | Corrected code generation | +----------------------------- | ; FUNCTION main (BEGIN) | ; SOURCE LINE # 10 | ; SOURCE LINE # 12 | 0000 900000 R MOV DPTR,#tSt | 0003 E0 MOVX A,@DPTR | | 0004 C3 CLR C -----------\ 0005 13 RRC A \ 0006 5401 ANL A,#01H +---- The generated code evaluates now the bit position 1. 0008 14 DEC A / 0009 7004 JNZ ?C0003 -----------/
-
[LX51 Linker/Locater]
-
Corrected: Under some circumstances the LX51 locates the
stack segment to a wrong adress inside the idata address space.
This problem was introduced with C51 version 9.55. Example:
+------------------------------------------------------------------------ Wrong stack location inside the data/idata memory space +------------------------------------------------------------------------ MEMORY MAP OF MODULE: Repro (?C_STARTUP) START STOP LENGTH ALIGN RELOC MEMORY CLASS SEGMENT NAME ========================================================================= * * * * * * * * * * * D A T A M E M O R Y * * * * * * * * * * * * * 000000H 000007H 000008H --- AT.. DATA "REG BANK 0" 000008H 000015H 00000EH BYTE UNIT DATA ?DT?MAIN 000016H 000017H 000002H BYTE UNIT DATA ?DT?USB 000018H 000018H 000001H BYTE UNIT DATA ?DT?WATCHDOG 000019H 000019H 000001H BYTE UNIT DATA ?C?LIB_DATA 00001AH 00001AH 000001H BYTE UNIT IDATA ?STACK <--------+--- Wrong stack location 00001BH.0 00001FH.7 000005H.0 --- --- **GAP** | 000020H.0 000020H.3 000000H.4 BIT UNIT BIT _BIT_GROUP_ | 000020H.4 000020H.6 000000H.3 BIT UNIT BIT ?BI?MAIN | 000020H.7 000020H 000000H.1 --- --- **GAP** | 000021H 00004FH 00002FH BYTE UNIT DATA _DATA_GROUP_ | 000050H 000077H 000028H BYTE UNIT DATA ?DT?GLOBALS | | | | +------------------------------------------------------------------------ | Corrected stack location inside the data/idata memory space | +------------------------------------------------------------------------ | | MEMORY MAP OF MODULE: Repro (?C_STARTUP) | | START STOP LENGTH ALIGN RELOC MEMORY CLASS SEGMENT NAME | ========================================================================= | | * * * * * * * * * * * D A T A M E M O R Y * * * * * * * * * * * * * | 000000H 000007H 000008H --- AT.. DATA "REG BANK 0" | 000008H 000015H 00000EH BYTE UNIT DATA ?DT?MAIN | 000016H 000017H 000002H BYTE UNIT DATA ?DT?USB | 000018H 000018H 000001H BYTE UNIT DATA ?DT?WATCHDOG | 000019H 000019H 000001H BYTE UNIT DATA ?C?LIB_DATA | 00001AH.0 00001FH.7 000006H.0 --- --- **GAP** | 000020H.0 000020H.3 000000H.4 BIT UNIT BIT _BIT_GROUP_ | 000020H.4 000020H.6 000000H.3 BIT UNIT BIT ?BI?MAIN | 000020H.7 000020H 000000H.1 --- --- **GAP** | 000021H 000050H 000030H BYTE UNIT DATA _DATA_GROUP_ | 000051H 000078H 000028H BYTE UNIT DATA ?DT?GLOBALS | 000079H 000079H 000001H BYTE UNIT IDATA ?STACK <--------+--- Correct stack location - New: the warning L48: Ignored Recursive Call Callee: function-name Caller: function-name will be issued when a reentrant function calls a non-reentrant function.
-
Corrected: Under some circumstances the LX51 locates the
stack segment to a wrong adress inside the idata address space.
This problem was introduced with C51 version 9.55. Example:
-
[A51 Assembler] and [AX51 Assembler]
- Removed: a path length limitation of 127 characters.
-
[New Supported
Devices]
-
ABOV
MC95FG0128, MC95FG6128, MC95FG8128, MC95FG208, MC95FG308,
MC95FR332, MC95FR364, MC95FR432, MC95FR464, MC96F1206,
MC96F4548, MC96F6332, MC96F6432, MC96F6408A, MC96F6508A,
MC96F6632, MC96F6832, MC96F7064, MC96F7416A, MC96F7616A,
MC96F7616T, MC96F7816, MC96F7664, MC96F7864, MC96F7848C,
MC96F8204, MC96F8208, MC96F8216, MC96F8316, MC96FC664A,
MC96FC864A, MC96FD316, MC96FM204, MC96FM214, MC96FM408,
MC96FR116C, MC96FR3128, MC96FR4128, MC96FR332A, MC96FR364B,
MC96FR364C, MC96FT1616, MC96FT1704, MC96FT241, MC96FT242,
MC97F2464, MC97F2664, MC97F60128, MC97F66128, MC97F68128,
MC97F68128A, and MC97FG316.
-
ABOV
-
[µVision]
- This C51 release comes with µVision V5.20.0.39.
-
[Supported Operating
Systems]
- µVision and it's dynamically loaded libraries (DLL) have been ported to MSVC 2015. MSVC 2015 does not officially support Windows XP anylonger.
- Refer to System Requirements Overview for hardware and operating system requirements.
ProductsDevelopment Tools |
Hardware & Collateral |
Downloads |
Support |
Contact |
 |
||||