NEC PD78F9488 - Manual (Page 319)

User’s Manual U15331EJ4V1UD
319
CHAPTER 19 FLASH MEMORY VERSION
The µPD78F9488 is available as the flash memory version of the µPD789488 (mask ROM version).
The µPD78F9489 is available as the flash memory version of the µPD789489 (mask ROM version).
The differences between the µPD78F9488, 78F9489, and the mask ROM version are shown in Table 19-1.
Table 19-1. Differences Between µPD78F9488, 78F9489, and Mask ROM Version
Flash Memory Version Mask ROM Version Item
µ PD78F9488 µ PD78F9489 µ PD789488 µ PD789489
ROM 32 KB (flash
memory) 48 KB (flash
memory) 32 KB 48 KB
Internal RAM 1024 bytes 1536 bytes 1024 bytes 1536 bytes
Internal memory
LCD display RAM 28 × 4 bits
Pin function selection
S16 to S27 (LCD segment output) or
P70 to P73 and P80 to P87 (general-
purpose ports) Selectable by a port function register (PF7
and PF8) in bit units Selectable by a mask option in bit
units
Circuit to multiply subsystem clock by ×4 Use enabled/disabled by subclock select
register (SSCK)
Use enabled/disabled by a mask
option
Pull-up resistor of port 5 None Selectable by a mask option in 1-bit
units
Remote controller receiver Not provided Provided Not provided Provided
Key return signal detection pins P00/KR0 to
P07/KR7 P00/KR00 to
P07/KR07,
P60/ANI0/KR10 to
P67/ANI7/KR17 P00/KR0 to
P07/KR7 P00/KR00 to
P07/KR07,
P60/ANI0/KR10 to
P67/ANI7/KR17
Restrictions in HALT mode when using
subclock
×4 clock
Refer to 19.2 Cautions on µ PD78F9488
and 78F9489
None
IC0 pin Not provided Provided
V
PP
pin Provided Not Provided
Electrical specifications Refer to CHAPTER 22 ELECTRICAL SPECIFICATIONS ( µ PD789488, 78F9488,
789489, 78F9489)
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.