78F0988 View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

78F0988

8-BIT SINGLE-CHIP MICROCONTROLLERS / 64 Pin

NEC => Renesas Technology 

µPD78F0988A, 78F0988A(A)

1. DIFFERENCES BETWEEN µPD78F0988A AND MASK ROM VERSIONS

The µPD78F0988A is a product with a flash memory which enables on-board writing, erasing and rewriting of

programs.

Except for flash memory specifications, the same functions as those of mask ROM versions can be obtained by

setting the internal memory size switching register (IMS) and internal expansion RAM size switching register (IXS).

Table 1-1 shows the differences between the flash memory version (µPD78F0988A) and mask ROM versions

(µPD780982, 780983, 780984, 780986, 780988).

Table 1-1. Differences Between µPD78F0988A and Mask ROM Versions

Item

µPD78F0988A

Mask ROM Versions

Internal ROM structure

Flash memory

Mask ROM

Internal ROM capacities

60 KB

µPD780982: 16 KB

µPD780983: 24 KB

µPD780984: 32 KB

µPD780986: 48 KB

µPD780988: 60 KB

Internal expansion RAM capacities

1024 bytes

µPD780982: None

µPD780983: None

µPD780984: None

µPD780986: 1024 bytes

µPD780988: 1024 bytes

Change of internal ROM capacity with internal

memory size switching register (IMS)

AvailableNote 1

Not available

Change of internal expansion RAM capacity with

AvailableNote 2

internal expansion RAM size switching register (IXS)

Not available

TEST pin

Not provided

Provided

VPP pin

Provided

Not provided

Notes 1. Flash memory capacity becomes 60 KB by RESET input.

2. Internal expansion RAM capacity becomes 0 bytes by RESET input.

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 versions. In addition, when

replacing the µPD78F0988 with the µPD78F0988A, be sure to also conduct sufficient evaluation

with the µPD78F0988A.

10

Data Sheet U15801EJ1V0DS

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