68HC05PL4B datasheet(93/98 Pages) FREESCALE

93 / 98 page

April 30, 1998

GENERAL RELEASE SPECIFICATION

MC68HC05PL4

REV 2.0

A-3

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:

1. Set the ELAT bit

2. Write the data to the address to be programmed

3. Set the PGM bit

4. Delay for a time tPGMR

5. Clear the PGM bit

6. Clear the ELAT bit

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

CAUTION

It is important to remember that an external programming voltage

must be applied to the VPP pin while programming, but it should be

equal to VDD during normal operations.

Figure A-2

shows the o w required to successfully program the EPROM.

A.5

EPROM PROGRAMMING SPECIFICATIONS

Table A-2. EPROM Programming Electrical Characteristics

(VDD = 4V ±10%, VSS = 0 Vdc, TA = 0°C to +70°C, unless otherwise noted)

Characteristic

Symbol

Min

Typ

Max

Unit

Programming Voltage

VPP

—

12.5

—

Programming Current

IPP

—

Programming Time per byte

tEPGM

—1—

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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