68HC05PL4B datasheet(91/98 Pages) FREESCALE

91 / 98 page

April 30, 1998

GENERAL RELEASE SPECIFICATION

MC68HC05PL4

REV 2.0

A-1

APPENDIX A

MC68HC705PL4

This appendix describes the MC68HC705PL4 and MC68HC705PL4B, the emula-

tion parts for MC68HC05PL4 and MC68HC05PL4B respectively. The entire

MC68HC05PL4

data

sheet

applies

the

MC68HC705PL4

and

MC68HC705PL4B, with exceptions outlined in this appendix.

References to MC68HC705PL4 in this appendix refers to both the

MC68HC705PL4 and MC68HC705PL4B devices, unless otherwise stated.

A.1

INTRODUCTION

The MC68HC705PL4 is an EPROM version of the MC68HC705PL4, and the

MC68HC705PL4B is an EPROM version of the MC68HC705PL4B. Both HC705

parts are used as the emulation part for their MC68HC05 counterparts. Both

MC68HC705 parts are functionally identical to their MC68HC05 counterparts,

with the exception of the 4k-bytes user ROM is replaced by 4k-bytes user

EPROM.

A.2

MEMORY

The MC68HC705PL4 memory map is shown on Figure A-1.

A.3

BOOTLOADER MODE

Bootloader mode is entered upon the rising edge of RESET if LED/IRQ/VPP pin is

at VTST and PB0/KBI0 at VDD. The Bootloader program is masked in the ROM

area from $1E00 to $1FEF. This program handles copying of user code from an

external EPROM into the on-chip EPROM. The bootload function has to be done

from an external EPROM. The bootloader performs one programming pass at

1ms per byte then does a verify pass.

A.4

EPROM PROGRAMMING

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

ister located at address $001E.

Please contact Freescale for programming board availability.

Table A-1. MC68HC705PL4 and MC68HC705PL4B Differences

Device

Pin27

MC68HC705PL4

PA0

MC68HC705PL4B

OSC2

Freescale Semiconductor, Inc.

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