MC68HC705JJ7 Datasheet, PDF (115/164 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 12
Personality EPROM (PEPROM)
12.1 Introduction
This section describes how to program the 64-bit personality erasable programmable read-only memory
(PEPROM). Figure 12-1 shows the structure of the PEPROM subsystem.
NOTE
In packages with no quartz window, the PEPROM functions as one-time
programmable ROM (OTPROM).
INTERNAL DATA BUS
$000F
PEPROM STATUS/CONTROL REGISTER
RESET
SINGLE
SENSE
AMPLIFIER
V_PP
ROW 0
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
V_PP SWITCH
8-TO-1 COLUMN DECODER
AND MULTIPLEXER
8-TO-1 ROW DECODER
AND MULTIPLEXER
V_PP SWITCH
ROW ZERO
DECODER
PEPROM BIT SELECT REGISTER
INTERNAL DATA BUS
$000E
RESET
Figure 12-1. Personality EPROM Block Diagram
MC68HC705JJ7 • MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
115