Chapter 19 Flash Memory Version - NEC PD789488 User Manual

µ
The PD78F9488 is available as the flash memory version of the
µ
The PD78F9489 is available as the flash memory version of the
The differences between the
Table 19-1. Differences Between
Item
Internal memory ROM
Internal RAM
LCD display RAM
Pin function selection
S16 to S27 (LCD segment output) or
P70 to P73 and P80 to P87 (general-
purpose ports)
Circuit to multiply subsystem clock by ×4
Pull-up resistor of port 5
Remote controller receiver
Key return signal detection pins
Restrictions in HALT mode when using
subclock ×4 clock
IC0 pin
V pin
PP
Electrical specifications
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.

CHAPTER 19 FLASH MEMORY VERSION

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PD78F9488, 78F9489, and the mask ROM version are shown in Table 19-1.
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PD78F9488, 78F9489, and Mask ROM Version
Flash Memory Version
µ
PD78F9488
32 KB (flash
memory)
1024 bytes
28 × 4 bits
Selectable by a port function register (PF7
and PF8) in bit units
Use enabled/disabled by subclock select
register (SSCK)
None
Not provided
P00/KR0 to
P07/KR7
Refer to 19.2 Cautions on
and 78F9489
Not provided
Provided
Refer to CHAPTER 22 ELECTRICAL SPECIFICATIONS (
789489, 78F9489)
User's Manual U15331EJ4V1UD
µ
PD789488 (mask ROM version).
µ
PD789489 (mask ROM version).
µ µ
PD78F9489 PD789488
48 KB (flash 32 KB
memory)
1536 bytes 1024 bytes
Selectable by a mask option in bit
units
Use enabled/disabled by a mask
option
Selectable by a mask option in 1-bit
units
Provided Not provided
P00/KR00 to P00/KR0 to
P07/KR07, P07/KR7
P60/ANI0/KR10 to
P67/ANI7/KR17
µ
PD78F9488 None
Provided
Not Provided
Mask ROM Version
µ
PD789489
48 KB
1536 bytes
Provided
P00/KR00 to
P07/KR07,
P60/ANI0/KR10 to
P67/ANI7/KR17
µ
PD789488, 78F9488,
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