MOS INTEGRATED CIRCUIT

8-BIT SINGLE-CHIP MICROCONTROLLER

The

µPD780921, 780922, 780923, and 780924, which are members of the µPD780924 subseries of the 78K/0 series,

are suited to control general-purpose inverters.

Compared to the conventional

µPD78014 subseries or µPD78018F subseries products, EMI (Electro Magnetic Interface)

noise is reduced for the

µPD780924 subseries products.

A flash memory version, the

µPD78F0924, that can operate within the same power supply voltage range as the mask

ROM version, and various development tools are also provided.

The details of functions are described in the following user’s manuals. Be sure to read them before designing.

µPD780924 Subseries User’s Manual : Planned

78K/0 Series User’s Manual Instructions : IEU-1372

FEATURES

• Internal ROM and RAM

Item

Program memory

Data memory

Package

Part Number

(ROM)

(internal high-capacity RAM)

µPD780921

8 Kbytes

512 bytes

• 64-pin plastic shrink DIP (750 mil)

µPD780922

16 Kbytes

• 64-pin plastic QFP (14 x 14 mm)

µPD780923

24 Kbytes

1024 bytes

µPD780924

32 Kbytes

• External memory expansion space: 48 Kbytes

• Minimum instruction execution time: 0.24

µs (@ fX = 8.38-MHz operation)

• I/O ports: 47

• 8-bit resolution A/D converter: eight channels

• Serial interface: two channels

• Timer: Five channels

• Power supply voltage: VDD = 2.7 to 5.5 V

APPLICATIONS

Motor control for inverter-type air conditioners, washing machines, etc.

The information in this document contains applications using a device in advance of the production cycle. The parameters for the device

may change before final production or NEC Corporation, at its own discretion, may withdraw the device prior to its production.

µPD780921, 780922, 780923, 780924

©

1996

PRELIMINARY PRODUCT INFORMATION

Document No. U11804EJ1V0PM00 (1st edition)

Date Published November 1996 N

Printed in Japan