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User’s Manual U14701EJ3V0UD
CHAPTER 22
μ
PD78F0338
The
μ
PD78F0338 is provided as the flash memory version of the
μ
PD780318, 780328, and 780338 Subseries.
The
μ
PD78F0338 incorporates flash memory on which a program can be written, erased and overwritten while
mounted on the board.
Data can be written to the flash memory with the memory mounted on the target system (on-board). To do this,
connect the dedicated flash programmer to the target system.
Using flash memory in a development environment or application enables the following.
Software can be modified after soldering the
μ
PD78F0338 to the target system.
Many products can be produced in small quantities by distinguishing the software of each.
Data can be easily adjusted when mass-production is started.
Table 22-1 lists the differences between the
μ
PD78F0338 and the mask ROM versions.
Table 22-1. Differences Between
μ
PD78F0338 and Mask ROM Versions
Item
μ
PD78F0338
Mask ROM Versions
μ
PD780318 Subseries
μ
PD780328 Subseries
μ
PD780338 Subseries
Internal ROM structure
Flash memory
Mask ROM
Internal ROM capacity
60 KB
Note 1
μ
PD780316, 780326, 780336: 48 KB
μ
PD780318, 780328, 780338: 60 KB
I/O port
70
Note 2
70
62
54
Segment signal output pin for LCD
controller/driver
40 max.
Note 2
24 max.
32 max.
40 max.
Mask option to specify the on-chip
pull-up resistors of pins P60 to P63
Not possible
Possible
IC pin
Not provided
Provided
V
PP
pin
Provided
Not provided
Electrical specifications
Refer to data sheet of each product.
Notes 1.
The same capacity as the mask ROM versions can be specified by means of the memory size switching
register (IMS).
2.
The same I/O port and segment signal output pin can be specified by means of the pin function switching
registers 8 and 9 (PF8 and PF9).
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.