UPD78F9418A NEC, UPD78F9418A Datasheet - Page 256

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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differences between the µ PD78F9418A and the mask ROM versions are shown in Table 18-1.
256
Internal memory
Pull-up resistor
Divider resistor for LCD driving
IC pin
V
Electrical specifications
PP
The µ PD78F9418A is a version with the internal ROM of the mask ROM version replaced by flash memory. The
Cautions 1. There are differences in noise immunity and noise radiation between the flash memory and
pin
2. When A/D conversion result register 0 (ADCR0) is used as the 8-bit A/D converter
Item
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.
( µ µ µ µ PD789407A Subseries), ADCR0 will be manipulated by an 8-bit memory manipulation
instruction. When used as the 10-bit A/D converter ( µ µ µ µ PD789417A Subseries), ADCR0 will be
manipulated by a 16-bit memory manipulation instruction.
However, when the µ µ µ µ PD78F9418A is used as the flash memory version of the µ µ µ µ PD789405A,
789406A, and 789407A, ADCR0 can be manipulated by an 8-bit memory manipulation
instruction. In this case, use the object file assembled in the µ µ µ µ PD789405A, 789406A, and
789407A.
ROM
High-speed RAM
LCD data RAM
Table 18-1. Differences Between µ µ µ µ PD78F9418A and Mask ROM Versions
32 KB (Flash memory)
512 bytes
28 bytes
32 (software control only)
Not provided
Not provided
Provided
Refer to CHAPTER 21 ELECTRICAL SPECIFICATIONS.
CHAPTER 18 µ µ µ µ PD78F9418A
Flash Memory Version
µ PD78F9418A
User’s Manual U13952EJ3V0UD
12 KB
36 (software control: 32, mask option control: 4)
Can be specified on-chip by mask option
Provided
Not provided
µ PD789405A
µ PD789415A
Mask ROM Version
16 KB
µ PD789406A
µ PD789416A
24 KB
µ PD789407A
µ PD789417A