HC705E5GRSSLASHD datasheet(112/148 Pages) NXP

112 / 148 page

User EPROM

General Release Specification

MC68HC705E5 — Rev. 1.0

User EPROM

13.4 Programming Register

This register is used to program the EPROM array. Only the LATCH and

EPGM bits are available in user mode. To program a byte of EPROM,

set LATCH, write data to the desired address, then set EPGM for tEPGM.

LATCH — EPROM Latch Control

READ:

Any time

WRITE: Any time

0 = EPROM address and data bus configured for normal reads

1 = EPROM address and data bus configured for programming.

Causes address and data bus to be latched when a write to

EPROM is done. EPROM cannot be read if LATCH = 1.

EPGM — EPROM Program Control

READ:

Any time

WRITE: Cleared any time, set only if LATCH = 1

0 = Programming power switched off the EPROM array

1 = Programming power switched on to the EPROM array. If

LATCH = 0, then EPGM is cleared automatically. EPGM

cannot be set if LATCH is not set. LATCH and EPGM cannot

both be set on the same write.

Address:

$0011

Bit 7

654321

Bit 0

Read:

—————

LATCH

EPGM

Write:

Reset:

00001000

Figure 13-4. Programming Register (PROG)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC705E5GRS/D Datasheet(PDF) 112 Page - NXP Semiconductors