MC68HC05L16 Datasheet, PDF (138/146 Pages) Freescale Semiconductor, Inc – Microcontrollers

MC68HC705L16
A.10.2 Program Control Register
A program control register is provided for EPROM programming.
Address: $000D
Bit 7
6
5
4
3
2
1
Bit 0
Read:
R
R
R
R
R
R
ELAT
PGM
Write:
Reset: 0
0
0
0
0
0
0
0
R
= Reserved
Figure A-5. Program Control Register (PCR)
Bits 7–3 — Reserved
These bits are reserved and read as logic 0 in user mode.
Bit 2 — Reserved
This bit is not used and always reads as logic 0.
ELAT — EPROM LATch control
0 = EPROM address and data bus configured for normal reads
1 = EPROM address and data bus configured for programming (Writes to EPROM cause address
and data to be latched.) EPROM is in programming mode and cannot be read if ELAT is logic
1. This bit should not be set when no programming voltage is applied to the V_PP pin.
PGM — EPROM ProGraM command
0 = Programming power switched off from EPROM array
1 = Programming power switched on to EPROM array
If ELAT ≠ 1, then PGM = 0.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
138
Freescale Semiconductor