MC68HC705P9 Datasheet, PDF (25/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Memory
EPROM/OTPROM
EPROM/OTPROM
An MCU with a quartz window has 2104 bytes of erasable,
programmable ROM (EPROM). The quartz window allows EPROM
erasure with ultraviolet light.
NOTE: Keep the quartz window covered with an opaque material except when
programming the MCU. Ambient light may affect MCU operation.
In an MCU without the quartz window, the EPROM cannot be erased
and serves as 2104 bytes of one-time programmable ROM (OTPROM).
The following addresses are user EPROM/OTPROM locations:
• $0020–$004F
• $0100–$08FF
• $1FF8–$1FFF (reserved for user-defined interrupt and reset
vectors)
The mask option register (MOR) is an EPROM/OTPROM location at
address $0900.
7-mc68hc705p9
MOTOROLA
Memory
25