535
CHAPTER 26
μ
PD78F0058, 78F0058Y
The
μ
PD78F0058 and 78F0058Y have a flash memory whose contents can be written, erased, rewritten with the
device mounted on a PC board. Table 26-1 lists the differences between the flash memory versions (
μ
PD78F0058
and 78F0058Y) and the mask ROM versions (
μ
PD780053, 780054, 780055, 780056, 780053Y, 780054Y, 780055Y,
780056Y, and 780058Y).
Table 26-1. Differences Between
μ
PD78F0058, 78F0058Y and Mask ROM Versions
Item
μ
PD78F0058, 78F0058Y
Mask ROM Version
Internal ROM structure
Flash memory
Mask ROM
Internal ROM capacity
60 Kbytes
μ
PD780053, 780053Y: 24 Kbytes
μ
PD780054, 780054Y: 32 Kbytes
μ
PD780055, 780055Y: 40 Kbytes
μ
PD780056, 780056Y: 48 Kbytes
μ
PD780058, 780058Y: 60 Kbytes
Internal expansion RAM capacity
1,024 bytes
μ
PD780053, 780053Y: None
μ
PD780054, 780054Y: None
μ
PD780055, 780055Y: None
μ
PD780056, 780056Y: None
μ
PD780058, 780058Y: 1,024 bytes
Changing internal ROM capacities with
memory size switching register (IMS)
Possible
Note 1
Impossible
Changing of internal expansion RAM
capacity by internal expansion RAM size
switching register (IXS)
Possible
Note 2
Impossible
IC pin
None
Available
V
PP
pin
Available
None
Mask option for connecting internal pull-
up resistor to P60 to P63 pins
No mask option available that
connects pull-up resistor
Available
Notes 1.
RESET input makes the flash memory 60 Kbytes.
2.
RESET input makes the internal expansion RAM 1,024 bytes.
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.
Remark
Only the
μ
PD780058, 78F0058, 780058Y, 780058Y, and 78F0058Y are provided with an internal
expansion RAM size switching register.