在应用编程MAXQ微控制器中可分区擦除的程序和数据闪存

文章摘要：表5. 应用ROM闪存例程 Routine NumberRoutine NameEntry PointROMTable = ROM[800Dh]Entry PointPhysical Address2flashEraseSectorROM[ROMTable + 1]0x8XXX3flashEraseAllROM[ROMTable + 2]0x8XXX15flashWriteROM[ROMTable + 14]0x8XXXflashWrite Routineu16 flashWrite(u16 *pAddress, u16 iData)SummaryPrograms a single word

在应用编程MAXQ微控制器中可分区擦除的程序和数据闪存,标签：计算机控制技术,工厂电气控制技术,http://www.88dzw.com
表5. 应用ROM闪存例程

Routine Number	Routine Name	Entry Point ROMTable = ROM[800Dh]	Entry Point Physical Address
2	flashEraseSector	ROM[ROMTable + 1]	0x8XXX
3	flashEraseAll	ROM[ROMTable + 2]	0x8XXX
15	flashWrite	ROM[ROMTable + 14]	0x8XXX

flashWrite

Routine	u16 flashWrite(u16 *pAddress, u16 iData)
Summary	Programs a single word of flash memory.
Inputs	A[0] - Word address in flash memory to which to write. A[1] - Word value to write to flash memory.
Outputs	Carry: Set on error and cleared on success. If set, then A[0] contains one of the following error codes: 1 : failure due to software timeout 2 : failure reported by hardware (DQ5/FERR) 4 : command not supportedSW_FERR - Set on error, cleared on success.
Notes	The watchdog must not be active, or the watchdog timeout must be set long enough to complete this routine without triggering a reset.

以下汇编代码实例采用间接寻址方法(查表)调用flashWrite()应用例程。该例程可由C代码调用。

; This routine is callable by C code using the following prototype
; u16 flashWrite(u16 *pAddress, u16 iData);
;
flashWrite:
    move APC, #0           ; No auto inc/dec of accumulator.
    move AP,  #2           ; Set ACC to A[2]
    move DP[0], #0800Dh    ; This is where the address of the table is stored.
    move ACC, @DP[0]       ; Get the location of the routine table.
    add  #14               ; Add the index to the flashWrite routine.
    move DP[0], ACC
    move ACC, @DP[0]       ; Retrieve the address of the routine.
    call ACC               ; Execute the routine.
    ret                    ; Status returned in A[0]

flashEraseSector

Routine	u16 flashEraseSector(void *pAddress)
Summary	Erases a single sector of flash memory
Inputs	A[0] - Address located in the sector to erase.
Outputs	Carry: Set on error and cleared on success. If set, then A[0] contains one of the following error codes: 1 : failure due to software timeout 2 : failure reported by hardware (DQ5/FERR) 4 : command not supported SW_FERR - Set on error, cleared on success.
Notes	The watchdog must not be active, or the watchdog timeout must be set long enough to complete this routine without triggering a reset.

; This routine is callable by C code using the following prototype
; u16 flashEraseSector(void *pAddress);
;
flashEraseSector:
    move APC, #0           ; No auto inc/dec of accumulator.
    move AP,  #1           ; Set ACC to A[1]
    move DP[0], #0800Dh    ; This is where the address of the table is stored.
    move ACC, @DP[0]       ; Get the location of the routine table.
    add  #1                ; Add the index to the flashEraseSector routine.
    move DP[0], ACC
    move ACC, @DP[0]       ; Retrieve the address of the routine.
    call ACC               ; Execute the routine.
    ret                    ; Status returned in A[0]

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