68HC05CL48 datasheet(135/145 Pages) MOTOROLA

135 / 145 page

June 11, 1997

GENERAL RELEASE SPECIFICATION

MC68HC05CL48

MOTOROLA

REV 2.0

A-3

A.4

EPROM PROGRAMMING

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

Please contact Motorola for programming board availability.

A.4.1 EPROM Program Control Register (EPCR $26)

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

MC68HC705CL48.

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.

A.4.2 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.

EPCR

$0026

bit-7

bit-6

bit-5

bit4

bit-3

bit-2

bit1

bit-0

Read

RESERVED

ELAT

PGM

Write

Reset

0000

000

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