Flash Memory Control Register - Philips P89LPC906 User Manual

Philips Semiconductors
FLASH PROGRAM MEMORY
FMCON
Address: E4h
Not bit addressable
Reset Source(s): Any reset
Reset Value:
BIT SYMBOL
FMCON.7-4 -
FMCON.3 HVA
FMCON.2 HVE
FMCON.1 SV
FMCON.0 OI
;* Inputs:
;* R3 = number of bytes to program (byte)
;* R4 = page address MSB(byte)
;* R5 = page address LSB(byte)
;* R7 = pointer to data buffer in RAM(byte)
;* Outputs:
;* R7 = status (byte)
;* C = clear on no error, set on error
LOAD EQU 00H
EP EQU 68H
PGM_USER:
MOV FMCON,#LOAD
MOV FMADRH,R4
MOV FMADRL,R5
MOV A,R7
MOV R0,A
LOAD_PAGE:
MOV FMDAT,@R0
INC R0
DJNZ R3,LOAD_PAGE
MOV FMCON,#EP
MOV R7,FMCON
MOV A,R7
ANL A,#0FH
JNZ BAD
CLR C
RET
BAD:
SETB C
RET
2003 Dec 8
7 6
- -
FUNCTION
Reserved.
High voltage abort. Set if either an interrupt or a brown-out is detected during a program
or erase cycle. Also set if the brown-out detector is disabled at the start of a program or
erase cycle.
High voltage error. Set when an error occurs in the high voltage generator.
Security violation. Set when an attempt is made to program, erase, or CRC a secured
sector or page.
Operation interrupted. Set when cycle aborted due to an interrupt or reset.
Figure 14-1: Flash Memory Control Register
;load command, clears page register
;get high address
;get low address
;
;get pointer into R0
;write data to page register
;point to next byte
;do until count is zero
;else erase & program the page
;copy status for return
;read status
;save only four lower bits
;
;clear error flag if good
;and return
;set error flag
;and return
91
5 4 3
- - HVA
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User's Manual - Preliminary -
P89LPC906/907/908
2 1 0
HVE SV OI