MC68HC908GP20 Datasheet, PDF (172/406 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

HVEN — High-Voltage Enable Bit
This read/write bit enables the charge pump to drive high voltages for
program and erase operations in the array. HVEN can only be set if
either PGM = 1 or ERASE = 1 and the proper sequence for
program/margin read or erase is followed.
1 = High voltage enabled to array and charge pump on
0 = High voltage disabled to array and charge pump off
MARGIN — Margin Read Control Bit
This read/write bit configures the memory for margin read operation.
MARGIN cannot be set if the HVEN = 1. MARGIN will return to unset
automatically if asserted when HVEN is set.
1 = Margin read operation selected
0 = Margin read operation unselected
ERASE — Erase Control Bit
This read/write bit configures the memory for erase operation. ERASE
is interlocked with the PGM bit such that both bits cannot be equal to
1 or set to 1 at the same time.
1 = Erase operation selected
0 = Erase operation unselected
PGM — Program Control Bit
This read/write bit configures the memory for program operation. PGM
is interlocked with the ERASE bit such that both bits cannot be equal
to 1 or set to 1 at the same time.
1 = Program operation selected
0 = Program operation unselected
Advance Information
172
MC68HC908GP20 — Rev 2.1
Freescale Semiconductor