257
CHAPTER 22
µ
PD78F0974
The
µ
PD78F0974 replace the internal ROM of the
µ
PD780973(A) with flash memory to which a program can be
written, deleted and overwritten while mounted on a board. Table 22-1 lists the differences between the
µ
PD78F0974
and the
µ
PD780973(A).
Table 22-1. Differences between
µ
PD78F0974 and
µ
PD780973(A)
Item
µ
PD78F0974
µ
PD780973(A)
ROM type
Flash memory
Mask ROM
Internal ROM capacity
32 Kbytes
24 Kbytes
Internal high-speed RAM capacity
1024 bytes
768 bytes
Change of internal ROM and internal
Possible
Note
Not provided
high-speed RAM capacity using
memory size switching register
IC pin
None
Available
V
PP
pin
Available
None
Electrical specifications
See data sheet of each product.
Quality grade
Standard
Special
Note Although the initial value is CFH, set the following values.
IMS Setting Value
Flash Memory
Internal
Remarks
High-speed RAM
06H
24 Kbytes
768 bytes
When using the same memory map as that of
µ
PD780973(A)
C8H
32 Kbytes
1024 bytes
When using the maximum value
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.
Содержание mPD780973 Series
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