Chapter 17 Μ Μ Μ Μ Pd78F9436, 78F9456 - NEC mPD789426 Series User Manual

The µ PD78F9436 and 78F9456 are available as the flash memory versions of the µ PD789426, 789436, 789446,
and 789456 Subseries.
The µ PD78F9436 is a version with the internal ROM of the µ PD789426 and 789436 Subseries replaced with flash
memory and the µ PD78F9456 is a version with the internal ROM of the µ PD789446 and 789456 Subseries replaced
with flash memory. The differences between the µ PD78F9436, 78F9456 and the mask ROM versions are shown in
Table 17-1.
Table 17-1. Differences Between µ µ µ µ PD78F9436, 78F9456 and Mask ROM Versions
Part Number
Item
Internal ROM
memory
High-speed RAM
LCD display RAM 5 bytes
IC pin
V pin
PP
Electrical specifications
Caution There are differences in noise immunity and noise radiation between the flash memory and mask
ROM versions. When pre-producing an application set with the flash memory version and then
mass-producing it with the mask ROM version, be sure to conduct sufficient evaluations for the
commercial samples (not engineering samples) of the mask ROM version.
CHAPTER 17 µ µ µ µ PD78F9436, 78F9456
Flash Memory Version
µ PD78F9436 µ PD78F9456
12 KB 16 KB
512 bytes
15 bytes
Not provided
Provided
Varies depending on flash memory or mask ROM versions.
User's Manual U15075EJ1V0UM00
Mask ROM Version
µ PD789425, µ PD789426,
789435 789436
12 KB 16 KB
5 bytes
Provided
Not provided
µ PD789445, µ PD789446,
789455 789456
12 KB 16 KB
15 bytes
291