Freescale Semiconductor, Inc.
FLASH 2TS Memory
A special bit will be maintained by the routine, called a cycling bit, in each
row. This bit is used to ensure that the data is programmed to all the rows
defined in the range. This is the high bit of the first byte in each row. This
bit cannot be used to store user data. It will be modified by the
REDPROG routine. This is at bit 7 of the byte at address DATA+0.
To determine which row to program, the algorithm will step from the first
to the last row in a range looking for the first row whose cycling bit is
different from the first. If all rows contain the same cycling bit, then the
first row will be used.
The row whose cycling bit is different will be erased and the entire row
will be programmed with the given data, including a toggled version of
the cycling bit.
4.11.5 Example Routine Calls
This code is for illustrative purposes only and does not represent valid
syntax for any particular assembler.
RAM
EQU
EQU
EQU
EQU
EQU
$80
RDVRRNG
PRGRNGE
ERANRGE
REDPROG
$F000
$F003
$F006
$F009
;*************************************************************
RAM Definitions for Subroutines
;**************************************************************
ORG
RAM+8
CTRLBYT
CPUSPD
LADDR
BUMPS
DERASE
RMB
RMB
RMB
RMB
RMB
1
1
2
1
2
;Allocation of “DATA” space is dependent on the device and
;application
Advance Information
58
MC68HC908RFRK2
MOTOROLA
FLASH 2TS Memory
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