CHAPTER 17 µPD78F9436, 78F9456
The µPD78F9436 and 78F9456 are available as the flash memory versions of the µPD789426, 789436, 789446,
and 789456 Subseries.
The µPD78F9436 is a version with the internal ROM of the µPD789426 and 789436 Subseries replaced with flash
memory and the µPD78F9456 is a version with the internal ROM of the µPD789446 and 789456 Subseries replaced
with flash memory. The differences between the µPD78F9436, 78F9456 and the mask ROM versions are shown in
Table 17-1.
Table 17-1. Differences Between µPD78F9436, 78F9456 and Mask ROM Versions
Part Number
Flash Memory Version
Mask ROM Version
Item
µPD78F9436 µPD78F9456
µPD789425,
µPD789426,
789436
µPD789445,
µPD789446,
789435
789455
789456
Internal
memory
ROM
12 KB
16 KB
12 KB
16 KB
12 KB
16 KB
High-speed RAM 512 bytes
LCD display RAM 5 bytes
Not provided
15 bytes
5 bytes
15 bytes
IC pin
Provided
Not provided
VPP pin
Provided
Electrical specifications
Varies depending on flash memory or mask ROM versions.
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.
User’s Manual U15075EJ1V0UM00
291
NEC [ NEC ]
