HC705C9AGRSSLASHD datasheet(153/157 Pages) NXP

153 / 157 page

General Release Specification

MC68HC705C9A — Rev. 2.0

A.5 Programming Register (PROG)

This register is used to program the EPROM array. To program a byte

of EPROM, set LATCH, write data to the desired address, and set

EPGM for tEPGM.

LATCH — EPROM Latch Control

This read/write bit controls the latching of the address and data buses

when programming the EPROM.

1 = Address and data buses latched when the following instruction

is a write to one of the EPROM locations. Normal reading is

disabled if LATCH = 1.

0 = EPROM address and data bus configured for normal reading

EPGM — EPROM Program Control

This read/write bit controls whether the programming voltage is

applied to the EPROM array. For programming, this bit can be set

only if the LATCH bit has been set previously. Both EPGM and

LATCH cannot be set in the single write.

1 = Programming voltage applied to EPROM array

0 = Programming voltage not applied to EPROM array

NOTE:

Bits 7–3 and bit 1 MUST be set to zero when writing to the EPROM

programming register.

$001X

Bit 7

Bit 0

Read:

LATCH

EPGM

Write:

Reset:

Figure A-1. EPROM Programming Register

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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