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diff --git a/src/devices/cpu/upd78k/upd78k3.h b/src/devices/cpu/upd78k/upd78k3.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+/**********************************************************************
+
+ NEC 78K/III series 16/8-bit single-chip microcontrollers
+
+**********************************************************************/
+
+#ifndef MAME_CPU_UPD78K_UPD78K3_H
+#define MAME_CPU_UPD78K_UPD78K3_H
+
+#pragma once
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> upd78k3_device
+
+class upd78k3_device : public cpu_device
+{
+public:
+ enum {
+ UPD78K3_PC,
+ UPD78K3_PSW, UPD78K3_PSWL, UPD78K3_PSWH, UPD78K3_RBS, UPD78K3_SP,
+ UPD78K3_RP0, UPD78K3_RP1, UPD78K3_RP2, UPD78K3_RP3,
+ UPD78K3_RP4, UPD78K3_RP5, UPD78K3_RP6, UPD78K3_RP7,
+ UPD78K3_AX, UPD78K3_BC,
+ UPD78K3_VP, UPD78K3_UP, UPD78K3_DE, UPD78K3_HL,
+ UPD78K3_R0, UPD78K3_R1, UPD78K3_R2, UPD78K3_R3,
+ UPD78K3_R4, UPD78K3_R5, UPD78K3_R6, UPD78K3_R7,
+ UPD78K3_R8, UPD78K3_R9, UPD78K3_R10, UPD78K3_R11,
+ UPD78K3_R12, UPD78K3_R13, UPD78K3_R14, UPD78K3_R15,
+ UPD78K3_X, UPD78K3_A, UPD78K3_C, UPD78K3_B,
+ UPD78K3_VPL, UPD78K3_VPH, UPD78K3_UPL, UPD78K3_UPH,
+ UPD78K3_E, UPD78K3_D, UPD78K3_L, UPD78K3_H
+ };
+
+ // TODO: callbacks and configuration thereof
+
+protected:
+ upd78k3_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, address_map_constructor mem_map, address_map_constructor sfr_map);
+
+ // device-level overrides
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+ // device_execute_interface overrides
+ virtual void execute_run() override;
+ virtual u64 execute_clocks_to_cycles(u64 clocks) const noexcept override { return (clocks + 2 - 1) / 2; }
+ virtual u64 execute_cycles_to_clocks(u64 cycles) const noexcept override { return (cycles * 2); }
+
+ // device_memory_interface overrides
+ virtual space_config_vector memory_space_config() const override;
+
+ // device_state_interface overrides
+ virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
+
+ virtual void state_add_psw();
+
+private:
+ // internal memory map
+ void iram_map(address_map &map);
+
+ // internal helpers
+ inline u8 register_base() const noexcept;
+
+ // address spaces, caches & configuration
+ address_space_config m_program_config;
+ address_space_config m_iram_config;
+ address_space_config m_sfr_config;
+ address_space *m_program_space;
+ memory_access_cache<0, 0, ENDIANNESS_LITTLE> *m_program_cache;
+ memory_access_cache<1, 0, ENDIANNESS_LITTLE> *m_iram_cache;
+ address_space *m_sfr_space;
+
+ // core registers and execution state
+ u16 m_pc;
+ u16 m_ppc;
+protected:
+ u16 m_psw;
+private:
+ u16 m_sp;
+ s32 m_icount;
+};
+
+// ======================> upd78312_device
+
+class upd78312_device : public upd78k3_device
+{
+public:
+ // device type constructor
+ upd78312_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+protected:
+ // device_disasm_interface overrides
+ virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
+
+ // device_state_interface overrides
+ virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
+
+ // upd78k3_device overrides
+ virtual void state_add_psw() override;
+
+private:
+ // type-specific internal memory maps
+ void mem_map(address_map &map);
+ void sfr_map(address_map &map);
+};
+
+// device type declaration
+DECLARE_DEVICE_TYPE(UPD78312, upd78312_device)
+
+#endif // MAME_CPU_UPD78K_UPD7832_H