MC68HC705E5 Datasheet, PDF (112/148 Pages) Freescale Semiconductor, Inc – General Release Specification

User EPROM
Freescale Semiconductor, Inc.
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 t_EPGM.
Address: $0011
Bit 7
6
5
4
3
2
1
Read:
—
—
—
—
—
LATCH
0
Write:
Reset: 0
0
0
0
1
0
0
Figure 13-4. Programming Register (PROG)
Bit 0
EPGM
0
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.
General Release Specification
User EPROM
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Go to: www.freescale.com
MC68HC705E5 — Rev. 1.0