MC68HC705C9A_1 Datasheet, PDF (153/157 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
General Release Specification
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 t_EPGM.
$001X
Read:
Write:
Reset:
Bit 7
6
5
4
3
2
1
LATCH
0
0
0
0
0
0
0
Figure A-1. EPROM Programming Register
Bit 0
EPGM
0
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.
MC68HC705C9A — Rev. 2.0
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