RX850, V850 Real-Time OS
Contents
1. Me C Windows Start Menu Programs Windows 98 When Windows is installed in drive C The files in the above folders may be deleted if one of the following conditions is satisfied The original file that is linked to the shortcut is not deleted e The file linked to the shortcut is missing e The shortcut with which an argument is specified for the link destination e The shortcut specifies the link to a work folder e Other than a shortcut If a shortcut is deleted the deleted item will not be displayed in the following menus e Start menu e Administrative Tools Control Panel Information on the deleted file will be lost so the deleted file will no longer be identified nor restored Workaround There is no workaround Action This issue will be corrected in the next version 3 Cautions None2. invalid when the execution returns from the interrupt and the operation becomes undefined This is because the interrupt routine activated by the RX850 does not save and restore the ep register values 0x8 pa The ep register values Interrupt must be 0x1 when execution returns from Task TA ATT interrupt but changes to 0x8 ep register 1 4 4 _ gt value 0x3ff8000 0x1 0x8 Ox3ff8000 Workaround Specify the options with the GHS compiler as follows so as not to use the ep register as the temporary register e When specifying OS or notda also specify Z71412 together e Do not specify allocate_ep Z1412 is an internal option and is only available in currently available compiler Ver 4 0 7 Rel 7 0 3 or earlier The specification may change in conjunction with the compiler revision so consult a GHS compiler dealer for whether this bug applies to compilers released after April 2006 Action This issue will be corrected in the next revision ZBG CD 08 0052 Attachment 4 4 No 6 Restriction on installing uninstalling a tool Source version only Description If the RX850 source version is installed or uninstalled some items such as shortcuts will be lost The items that are placed in the following folders may be deleted Windows OS Folder Windows XP C Document and Settings All Users Start Menu Programs Windows 2000 Windows NT C Winnt Profiles All Users Start Menu Programs Windows
3. 2 Attachment 3 4 Cause This bug occurs because handling of the ep register differs between the RX850 and GHS compiler The GHS compiler handles the ep register as a base register for accessing TDA and also handles the ep register as a temporary register In contract the RX850 only handles the ep register as a base register for accessing TDA Due to this difference the problems described in the following examples occur if the RX850 operates while the GHS compiler is using the ep register as a temporary register Example 1 If an interrupt is generated by RX850 in a section in which the ep register has been overwritten dotted line in the figure below and TDA is accessed by the interrupt routine shaded portion in the figure below the execution will access an invalid address This is because the interrupt routine activated by the RX850 cannot recognize that the ep register is used as the temporary register and it cannot recognize that the interrupt handler accesses TDA TDA access must Interrupt i be performed while ep 0x3ff8000 Task TA AT but is performed while ep register 41 gt 4 gt ___ gt ep 0x1 value 0x3ff8000 0x1 Ox3ff8000 Example 2 If an interrupt is generated in a section in which the ep register has been overwritten dotted line in the figure below and the ep register is overwritten by the interrupt routine shaded portion in the figure below the temporary register values become
4. Microcontroller Technical Information Document No ZBG CD 08 0052 Date issued November 25 2008 Issued by Development Tool Solution Group Multipurpose Microcomputer Systems Division Microcomputer Operations Unit RX850 V850 Real Time OS Usage Restrictions Related documents NEC Electronics Corporation RX850 Basics U13430EJ2 2nd or later Notification NI Usage restriction RX850 Installation U17419EJ1 1st or later classification Upgrade RX850 Technical U13431EJ2 2nd or later RD850 Task debugger U17420EJ1 1st or later AZ850 Ver 3 30 User s Manual U17423EJ2 2nd Other notification Document modification 1 Affected product RX850 Ver 3 20 2 New restriction The following restriction has been added See the attachment for details e No 6 Restriction on installing uninstalling a tool source version only 3 Workaround The following workaround is available for this restriction See the attachment for details e No 6 There is no workaround 4 Modification schedule Restriction No 6 will be corrected in the next revision of the RX850 release schedule is undetermined 5 Restriction history A list of restrictions in the RX850 including the revision history and detailed information is described on the following pages 6 Document revision history Document Number Issued on Description SBG T 2486 September 28 2001 Newly created ZBG CD 05 0017 February 24 2005 A
5. cro inc in the directory inc850 rx850 local get retadr intext a Workaround Correct the relevant line by using a text editor as follows local get retadr intext a Action This issue has been corrected in Ver 3 14 No 4 The task stack is lost when an NMI occurs Description If an NMI occurs while processing of a specific section is being performed during a task switching operation and the stack is used by the NMI handler the stack of the task is overwritten This section is in the interrupt disable state DI state and no maskable interrupts are acknowledged so this restriction applies only to NMIs Cause There is an error in the stack manipulation procedure during task switching processing Workaround There is no workaround Action This issue has been corrected in Ver 3 20 No 5 Access using the ep register may be invalid depending on the option specified with a GHS compiler Description If an application is compiled using a GHS compiler with any of the following optimization options specified a code that uses the ep register as a temporary register may be output e OS e notda e allocate_ep option added in MULTI Ver 4 0 2 Rel 7 0 1 and later If an interrupt directly indirectly activated interrupt is generated by the RX850 in a section in which the ep register is used as the temporary register the ep register values have been overwritten the subsequent operations may be undefined ZBG CD 08 005
6. ddition of new restriction No 4 ZBG CD 06 0036 April 24 2006 Addition of new restriction No 5 ZBG CD 08 0052 November 25 2008 Addition of new restriction No 6 ZBG CD 08 0052 Attachment 1 4 Usage Restrictions of RX850 1 Product History Bugs and Changes Additions to Specifications Applicable Version V3 11_ V3 13 V3 14 1 A task or cyclic handler that is waiting for time out may not be executed i z z gt 2 Task may not wake up when wup tsk is issued in handler x O O O 3 A compilation error occurs when macro RTOS_IntExit is described x O O 4 The task stack is lost when an NMI occurs x x x O 5 Access using the ep register may be invalid depending on the option x x x x specified with a GHS compiler 6 Installing uninstalling a tool source version only x x Applicable O Not applicable Not relevant 2 Details of Usage Restrictions No 1 A task or cyclic handler that is waiting for time out may not be executed Description A task or cyclic handler that is waiting for time out may not be executed Cause When a system call sig_sem etc that releases a time out wait is generated in a handler a flag indicating linkage to the timer queue may be set while the handler is not linked to the timer queue If the task then and issues a system call that enters time out waiting twai_sem etc the timer queue is disrupted and subsequent time out
7. waiting is not performed correctly Workaround There is no workaround Action This issue has been corrected in Ver 3 13 No 2 Task may not wake up when wup tsk is issued in handler Description The task may not wake up when a system call to wake up a task is issued in the handler Cause In RX850 V3 10 scheduling is performed after the idle handler has terminated Even if wup_tsk is executed in a cyclic handler or interrupt handler started by an interrupt issued between enabling interrupts and a halt instruction in the idle handler processing is halted by the halt instruction after returning to the idle handler Consequently the halt status is released in the next interrupt and the task is not woken up until scheduling is carried out after the idle handler has terminated Workaround Create a task with the lowest priority that carries out the same processing as the idle handler Action This issue has been corrected in Ver 3 13 ZBG CD 08 0052 Attachment 2 4 No 3 A compilation error occurs when macro RTOS_IntExit is described Description When using the direct startup handler in the RX850 for the CA850 if the macro RTOS _IntExit is described and compiled in the interrupt return processing a compilation error syntax error occurs in the macro section Cause There is a description error in the macro section The period is missing from the local quasi directive in the 127th line of the file ma
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