78K0 Series

78K0 Series [de; jp] (also known as 78K/0) is a long-running 8-bit single chip microcontroller,^[18] which is the basis of 78K0S [jp] 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.^[19] 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.^[20] But with the times, it became flash memory.^[21][22]

78K0S Series

78K0S Series (also known as 78K/0S) is a low-end version of 78K0.^[23][24][25] 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.^[26]

78K0R Series

78K0R Series is a 16-bit single-chip microcontroller with 3-stage instruction pipelining.^[27] Its instruction set is similar to 78K0 and covers 16- and 8-bit operations. It has 20-bit 1M Byte address space.^[28] 75 instructions out of 80 are identical with that of RL78 Family; its successor.^{[16]: 20 [15][29]}

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.^[30] It integrates 17K family's peripheral functions with the 78K0 8-bit CPU core on a chip.^[31]

178K0S Series

178K0S Series (also known as 178K/0S) is also a successor of 17K Family with the 78K0S CPU core.^[32]

78K4 Series

78K4 Series (also known as 78K/4) is a 16-bit single-chip microcontroller with 16 and 8-bit operations.^{[33][34][35][36]} 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.^[37] It has 24-bit 16M Byte address space. It has microcode-based operations named Macro Service with interrupt functions.^{[38]: §23.8, 560–593}

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,^{[39]: Photo 2} 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.^[40]

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.^{[41]: §13.4, 261–280}

This series is used for hard disk drives, especially Quantum Fireball Series.^[42] μPD78364 sub-series is used for inverter compressor controls.^[43] 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.^[44]

87AD Family

87AD Family^[4]: 229 is an 8-bit single-chip microcontroller. It has 8× 8-bit registers ×4 banks. Its instruction set architecture became the basis of 78K.^[45]

17K Family

17K Family^[4]: 229 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.^[30]