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Preliminary User’s Manual U16035EJ1V0UM
CHAPTER 18
µ
PD78F0034BS
The
µ
PD78F0034BS is provided as the flash memory version of the
µ
PD780024AS, 780034AS Subseries.
The
µ
PD78F0034BS replaces the internal mask ROM of the
µ
PD780034BS with flash memory to which a program
can be written, erased and overwritten while mounted on the board. Table 18-1 lists the differences among the
µ
PD78F0034BS and the mask ROM versions.
Table 18-1. Differences Among
µ
PD78F0034BS and Mask ROM Versions
Item
µ
PD78F0034BS
Mask ROM Versions
µ
PD780034AS Subseries
µ
PD780024AS Subseries
Internal ROM configuration
Flash memory
Mask ROM
Internal ROM capacity
32 KB
Note
µ
PD780031AS: 8 KB
µ
PD780021AS: 8 KB
µ
PD780032AS: 16 KB
µ
PD780022AS: 16 KB
µ
PD780033AS: 24 KB
µ
PD780023AS: 24 KB
µ
PD780034AS: 32 KB
µ
PD780024AS: 32 KB
Internal high-speed RAM capacity
1024 bytes
Note
µ
PD780031AS: 512 bytes
µ
PD780021AS: 512 bytes
µ
PD780032AS: 512 bytes
µ
PD780022AS: 512 bytes
µ
PD780033AS: 1024 bytes
µ
PD780023AS: 1024 bytes
µ
PD780034AS: 1024 bytes
µ
PD780024AS: 1024 bytes
Resolution of A/D converter
10 bits
8 bits
IC pin
None
Available
V
PP
pin
Available
None
Electrical specifications
Refer to data sheet of each product.
Note
The same capacity as the mask ROM versions can be specified by means of the memory size switching
register (IMS).
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.