MC705P6ACPE Datasheet, PDF(65/98 Page) Freescale Semiconductor, Inc

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MC705P6ACPE Datasheet, PDF (65/98 Pages) Freescale Semiconductor, Inc – M68HC05 Microcontrollers

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MOR Programming

11.3 MOR Programming

The contents of the MOR should be programmed in bootloader mode using the hardware shown in

Figure 10-2. MC68HC705P6A EPROM Programming Flowchart. In order to allow programming, all the

implemented bits in the MOR are essentially read-write bits in bootloader mode as shown in Figure 11-1.

The programming of the MOR is the same as user EPROM.

1. Set the ELAT bit in the EPROG register.

2. Write the desired data to the desired MOR address.

3. Set the EPGM bit in the EPROG.

4. Wait for the programming time (tEPGM).

5. Clear the ELAT and EPGM bits in the EPROG.

6. Remove the programming voltage from the IRQ/VPP pin.

A sample routine to program a byte of EPROM is shown in Table 11-2.

Once the MOR bits have been programmed, the options are not loaded into the MOR registers until the

part is reset.

Table 11-2. MOR Programming Routine

001C

00FF

0023

1EFF

1F00

0000

00E0

00E2

00E4

00E6

00E9

00EB

00ED

00EF

A6 04

B7 1C

A6 FF

C7 1E FF

12 1C

AD 03

3F 1C

EPROG

DATA2

DATA1

MOR2

MOR1

EPGM

EQU $1C

EQU $FF

EQU #23

EQU $1EFF

EQU $1F00

EQU $00

ORG $E0

LDA #$04

STA EPROG

LDA #DATA2

STA MOR2

BSET EPGM,EPROG

BSR DELAY

CLR EPROG

RTS

PROGRAMMING REG

SAMPLE MOR VALUES

MOPR ADDRESSES

EPGM BIT IN EPROG REG

SET ELAT BIT

IN EPGM REG AT $1C

DATA BYTE

WRITE IT TO MOR LOC

TURN ON PGM VOLTAGE

WAIT 4 ms MINIMUM

CLR EPGM REGISTER

MC68HC705P6A Advance Information Data Sheet, Rev. 2.1

Freescale Semiconductor

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