Maxim-integrated DS4830 Optical Microcontroller Manuel d'utilisateur télécharger pdf (Page 221)

DS4830 User’s Guide

221

25.2 – In-Application Programming Functions

25.2.1 – UROM_flashWrite

Function

UROM_flashWrite

Summary

Programs a single word of flash memory

Inputs

A[0]: Word address in program flash memory to write.

A[1]: Value to write to flash memory.

Outputs

Carry: Set on error and cleared on success

Destroys

PSF, LC[1]

Notes:

 This function uses two stack levels to save and restore values.

 If the watchdog reset function is active, it should be disabled before calling this function.

 Interrupts are disabled while in this function.

 If the flash location has already been programmed to a value other than FFFFh, this function returns with an

error (Carry set). In order to reprogram a flash location, the location must first be erased by calling

UROM_flashErasePage or UROM_flashEraseAll.

25.2.2 – UROM_flashErasePage

Function

UROM_flashErasePage

Summary

Erases (programs to FFFFh

)

a 512-byte page of flash memory.

Inputs

A[0]: Word address located in the page to be erased. (The page number is the high 8 bits of

A[0].)

Outputs

Carry: Set on error and cleared on success.

Destroys

PSF, LC[1], GR, AP, APC, A[0]

Notes:

 If the watchdog reset function is active, it should be disabled before calling this function.

 Interrupts are disabled while in this function.

 When calling this function from flash, care should be taken that the return address is not in the page which is

being erased.

25.2.3 –

UROM_flashEraseAll

Function

UROM_flashEraseAll

Summary

Erases (programs to FFFFh

)

all locations in flash memory

Inputs

None

Outputs

Carry: Set on error and cleared on success.

Destroys

PSF, GR, LC[1], LC[0], AP, APC,

A[0]

Notes:

 If the watchdog reset function is active, it should be disabled before calling this function.

 Interrupts are disabled while in this function..

 This function can only be called by code running from the RAM. Attempting to call this function while running

from the flash results in an error.

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Maxim-integrated DS4830 Optical Microcontroller Manuel d'utilisateur Page 221

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