Datasheet

674
On-chip
ROM space
(area 0)
H'0000
H'1FFFF (128-kbyte version)
H'00000000
H'0001FFFF (128-kbyte version)
Address for MCU 
modes 0, 1, 2, 3
Address for
PROM mode
Figure 21.5 On-Chip ROM Memory Map
21.3 PROM Programming
The PROM mode write/verify specifications are the same as those of the standard EPROM
HN27C101. However, because the page program format is not supported, do not set the PROM
writer to the page programming mode. PROM writers that only support page programming mode
cannot be used. When selecting a PROM writer, confirm that it supports the byte-by-byte high-
speed, high-reliability programming format.
21.3.1 Programming Mode Selection
There are two on-chip PROM programming modes: write and verify (reads and confirms written
data). The mode is selected by using the pins (table 21.2).
Table 21.2 PROM Programming Mode Selection
Pin
Mode
CE OE PGM V
PP
V
CC
I/O7–I/O0 A16–A0
Write 010V
PP
V
CC
Data input Address
Verify 0 0 1 Data output
input
Programming 0 0 0 High
Prohibited
011
impedance
100
111
Note: 0: low level, 1: high level, V
PP
: V
PP
level, V
CC
: V
CC
level.