68HC705JB2 datasheet(102/128 Pages) NXP

102 / 128 page

GENERAL RELEASE SPECIFICATION

August 28, 1998

EPROM

MC68HC705JB2

11-2

REV 1.1

11.3

EPROM PROGRAMMING

Programming the on-chip EPROM is achieved by using the Program Control

Please contact Motorola for programming board availability.

11.3.1 EPROM Program Control Register (PCR)

This register is provided for programming the on-chip EPROM.

MORON – Mask Option Register ON

0 =

Disable programming to Mask Option Register ($01FF)

1 =

Enable programming to Mask Option Register ($01FF)

ELAT – EPROM LATch control

0 =

EPROM address and data bus conﬁgured for normal reads

1 =

EPROM address and data bus conﬁgured for programming (writes

to EPROM cause address and data to be latched). EPROM is in

programming mode and cannot be read if ELAT is 1. This bit should

not be set when no programming voltage is applied to the Vpp pin.

PGM – EPROM ProGraM command

0 =

Programming power is switched OFF from EPROM array.

1 =

Programming power is switched ON to EPROM array. If ELAT

≠ 1,

then PGM = 0.

11.3.2 Programming Sequence

The EPROM programming sequence is:

Set the ELAT bit

Write the data to the address to be programmed

Set the PGM bit

Delay for a time tPGMR

Clear the PGM bit

Clear the ELAT bit

The last two steps must be performed with separate CPU writes.

PCR

$003E

bit-7

bit-6

bit-5

bit4

bit-3

bit-2

bit1

bit-0

Read

RESERVED

MORON

ELAT

PGM

Write

Reset

0000

000

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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