Philips P89LPC906 ERASE-PROGRAMMING Additional Flash Elements, Reading Additional Flash Elements

Philips Semiconductors				User’s Manual - Preliminary -
FLASH PROGRAM MEMORY			P89LPC906/907/908
Table 14-1: Flash elements accesable through IAP-Lite
Element	Address Description
UCFG1	00h	User Configuration byte 1.
Boot Vector
	02h	Boot vector
Status Bit	03h	Status bit byte
Security	08h	Security byte, sector 0
byte 0
Security	09h	Security byte, sector 1
byte 1
Security	0Ah	Security byte, sector 2
byte 2
Security	0Bh	Security byte, sector 3
byte3
Mfgr Id	10h	Signature byte, manufacturer id
Id_1	11h	Signature byte,id 1
Id_2	12h	Signature byte,id 2

ERASE-PROGRAMMING ADDITIONAL FLASH ELEMENTS

The erase-program cycle takes 4ms to complete and is accomplished using the following steps:

•Write the address of the flash element to FMADRL.

•Write the CONF command (6CH) to FMCON.

•Write the data to be programmed to FMDATA.

•Read FMCON to check status. If aborted, repeat this sequence.

Writing the data to be programmed to FMDATA will start the erase-program process and place the CPU in a program-idle state. The CPU will remain in this idle state until the erase-program cycle is either completed or terminated by an interrupt. When the program-idle state is exited, FMCON will contain status information for the cycle.

If an interrupt occurs during an erase/programming cycle, the erase/programming cycle will be aborted and the OI flag (Opera- tion Interrupted) in FMCON will be set. If the application permits interrupts during erasing-programming the user code should check the OI flag (FMCON.0) after each erase-programming operation to see if the operation was aborted. If the operation was aborted, the user’s code will need to repeat the process.

READING ADDITIONAL FLASH ELEMENTS

The read cycle is accomplished using the following steps:

•Write the address of the flash element to FMADRL.

•Write the CONF command (6CH) to FMCON.

•Read the data from FMDATA

The read cycle completes in a single machine cycle and thus will not enter an idle state. It can be interrupted. However, there is no need to check status.

An assembly language routine to perform an erase/program operation of a flash element is shown in Figure 14-4. A similar C- language routine is shown in Figure 14-5. A C-language routine to read a flash element is shown in Figure 14-6.

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