Freescale Semiconductor, Inc.
EPROM/OTPROM (PROM)
EPROM/OTPROM (PROM) Programming
9.3.1 Program Register
The program register (PROG) shown in Figure 9-3 is used for PROM
programming.
Address: $001C
Bit 7
6
0
0
5
0
0
4
0
0
3
0
0
2
LAT
0
1
0
0
Bit 0
PGM
0
Read:
Write:
Reset:
0
0
Figure 9-3. Program Register (PROG)
LAT — Latch Enable Bit
This bit is both readable and writable.
1 = Enables PROM data and address bus latches for programming
on the next byte write cycle
0 = Latch disabled. PROM data and address buses are unlatched
for normal CPU operations.
PGM — Program Bit
If LAT is cleared, PGM cannot be set.
1 = Enables VPP power to the PROM for programming
0 = VPP is disabled.
Bits 1 and 3−7 — Not used; always read 0
MC68HC705C8A — Rev. 3
MOTOROLA
Technical Data
EPROM/OTPROM (PROM)
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