M68HC08 datasheet(36/188 Pages) FREESCALE

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Memory

Data Sheet

MC68HC908RF2 — Rev. 4.0

Memory

MOTOROLA

The functions shown in Table 2-4 accept data through the CPU registers and

global variables in RAM. Table 2-5 shows the RAM locations that are used for

passing parameters.

2.5.8 Embedded Function Descriptions

This subsection describes the embedded functions.

2.5.8.1 RDVRRNG Routine

Name:

RDVRRNG

Purpose:

Read and/or verify a range of FLASH memory

Entry conditions:

H:X

Contains the first address of the range

LADDR

Contains the last address of the range

DATA

Contains the data to compare the read data against for read/verify to

RAM only (length is user determined)

ACC

Non-zero for read/verify to RAM, 0 for output to PA0

Exit conditions:

C bit

Set if good compare for read/verify to RAM only

ACC

Contains checksum

DATA

Contains read FLASH data for read/verify to RAM only

Ready/verify

RAM option:

This subroutine both compares data passed in the DATA array to the FLASH data

and reads the data from FLASH into the DATA array. It also calculates the

checksum of the data.

Output to PA0

option:

This subroutine dumps the data from the range to PA0 in the same format as

monitor data. It also calculates the checksum of the data.

NOTE:

This serial dump does not circumvent security because the security vectors must

still be passed to make FLASH readable in monitor mode.

Table 2-5. Embedded FLASH Routine Global Variables

Variable Location

Variable Address(1)

1. RAMSTART is defined as the starting address of the RAM in the memory map.

This is address $0080.

CTRLBYT

RAMSTART + 8

CPUSPD

RAMSTART + 9

LADDR

RAMSTART + 10

BUMPS

RAMSTART + 12

DERASE

RAMSTART + 13

DATA

RAMSTART + 15

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