78K0S Do-It

78K is the trademark name of 16- and 8-bit microcontroller family

manufactured by Renesas Electronics, originally developed by NEC
started in 1986.
The basis of 78K Family is an accumulator-based register-bank CISC architecture.
78K is a single-chip microcontroller, which usually integrates; program ROM, data RAM, serial interfaces, timers, I/O ports, an A/D converter, an interrupt controller, and a CPU core, on one die.

Its application area is mainly simple mechanical system controls and man-machine interfaces.

Regarding software development tools, C compilers and macro-assemblers are available.

As for development tool hardware, full probing-pod type and debug port type in-circuit emulators,

and flash ROM programmers
Renesas official:

are available.

Historically, the family has 11 series with 9 instruction set architectures. As of 2018, 3 instruction set architectures, those are 8-bit 78K0, 8-bit 78K0S, and 16-/8-bit 78K0R, are still promoted for customers' new designs.
But in most of cases, migration to RL78 Family,

which is a successor of 78K0R and almost binary level compatible with 78K0R,
is recommended.

Variants

78K0 Series

(also known as 78K/0) is a long-running 8-bit single chip microcontroller,

which is the basis of 78K0S and 78K0R Series. It contains 8× 8-bit registers ×4 banks. For 16-bit calculating instructions, it performs ALU operation twice. Each instructions are performed serially without instruction pipelining. It has 16-bit 64K Byte address space. Some variants of 78K0 have affordable and compact type 8-bit R-2R D/A converter, which does not have monotonicity because it is not trimmed for adjustment nor followed by operational amplifier.

In its earlier stage, the ''Program Memory'' was one-time PROM (OTP), UV-EPROM, or mask ROM.
Renesas official:

But with the times, it became flash memory.
Renesas official:

78K0S Series

78K0S Series (also known as 78K/0S) is a low-end version of 78K0.

It has 8× 8-bit registers, but without any banks. In addition, some instructions, such as multiplication and division, are removed from 78K0 instruction set architecture.

78K0R Series

78K0R Series is a 16-bit single-chip microcontroller with 3-stage instruction pipelining.

Its instruction set is similar to 78K0 and covers 16- and 8-bit operations. It has 20-bit 1M Byte address space. 75 instructions out of 80 are identical with that of RL78 Family; its successor.
Renesas official:

178K0 Series

178K0 Series (also known as 178K/0) is a successor of NEC's 17K Family 4-bit microcontroller for ''DTS (Digital Tuning Systems)'' and ''remote controls''.
It integrates 17K family's peripheral functions with the 78K0 8-bit CPU core on a chip.

178K0S Series

178K0S Series (also known as 178K/0S) is also a successor of 17K Family with the 78K0S CPU core.

78K4 Series

78K4 Series (also known as 78K/4) is a 16-bit single-chip microcontroller with 16 and 8-bit operations.

It has 16× 8-bit registers ×4 banks, which can be also used for 8× 16-bit registers ×4 banks. Some of these registers can be also used as 24-bit extension for addressing modes. It has 24-bit 16M Byte address space. It has microcode-based operations named ''Macro Service'' with interrupt functions.

78K7 Series

78K7 Series (also known as 78K/7) is a 32-bit single-chip microcontroller with 32, 16 and 8 bit operations. It has 8× 32-bit registers ×16 banks, which can be also used for 16× 16-bit registers ×16 banks and 16× 8-bit registers ×16 banks. It has microcode-based operations named ''Macro Service'' with interrupt functions. It has 24-bit 16M Byte linear address space. It is used for some Quantum ''Fireball'' products,
but shortly replaced with ''V850'' Family 32-bit RISC microcontrollers.

78K6 Series

78K6 Series (also known as 78K/6) is a 16-bit single-chip microcontroller. Its life-time was short, and less variants.

78K1 Series

78K1 Series (also known as 78K/1) is an 8-bit single-chip microcontroller. It has 8× 8-bit registers ×4 banks. 78K1 series is targeted for servo controls of videocassette recorders. μPD78148 sub-series integrates 2 operational amplifiers.

78K3 Series

78K3 Series (also known as 78K/3) is a 16-bit single-chip microcontroller with 16 and 8 bit operations. It has 16× 8-bit ×8 banks, which can be also used for 8× 16-bit registers ×8 banks. Its address space is 16-bit 64K Byte. It is developed as high-end series of 78K Family. It has microcode-based operations named ''Macro Service'' with interrupt functions.
Renesas official:

This series is used for hard disk drives, especially Quantum ''Fireball'' Series.
μPD78364 sub-series is used for inverter compressor controls.
Renesas official:

It is also used for traction control systems of some cars.

78K2 Series

78K2 Series (also known as 78K/2) is an 8-bit single-chip microcontroller. It has 8× 8-bit registers ×4 banks. It is developed as general purpose series of 78K Family.

Predecessors

87AD Family

87AD Family is an 8-bit single-chip microcontroller. It has 8× 8-bit registers ×4 banks. Its instruction set architecture became the basis of 78K.

17K Family

17K Family is a 4-bit single-chip microcontroller, especially dedicated for ''DTS (Digital Tuning Systems)'' and ''remote controls''. It has 2 plane of 128× 4-bit register files, and sophisticated fully orthogonal instruction set. This instruction set is completely different from that of 78K Family.

Table list of 78K Family

See also

*RL78
*V850
*Renesas 740
*IEBus

References

External links

*Technical documents

Application note: 78K/0 Series Basic (I) Renesas Electronics


** ttps://www.renesas.com/en-us/search/keyword-search.html#q=u10182e&genre=document Application note: 78K/0 Series Basic (III) Renesas Electronics*Web sites

78K Family Renesas Electronics



CPU of the Day: NEC 78C11 Sample and the 78K family The CPU Shack MUseum

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