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diff --git a/src/devices/cpu/upd78k/upd78k0.h b/src/devices/cpu/upd78k/upd78k0.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+/**********************************************************************
+
+ NEC 78K/0 series 8-bit single-chip microcontrollers
+
+**********************************************************************/
+
+#ifndef MAME_CPU_UPD78K_UPD78K0_H
+#define MAME_CPU_UPD78K_UPD78K0_H
+
+#pragma once
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> upd78k0_device
+
+class upd78k0_device : public cpu_device
+{
+public:
+ enum {
+ UPD78K0_PC, UPD78K0_PSW, UPD78K0_RBS, UPD78K0_SP,
+ UPD78K0_AX, UPD78K0_BC,
+ UPD78K0_DE, UPD78K0_HL,
+ UPD78K0_X, UPD78K0_A, UPD78K0_C, UPD78K0_B,
+ UPD78K0_D, UPD78K0_E, UPD78K0_H, UPD78K0_L
+ };
+
+ // configuration (TODO: callbacks)
+ void set_subclock(u32 clock) { m_subclock = clock; }
+ void set_subclock(const XTAL &xtal) { m_subclock = xtal.value(); }
+
+protected:
+ upd78k0_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, u16 iram_size, 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;
+
+ // 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;
+
+private:
+ // internal memory map
+ void iram_map(address_map &map);
+
+ // internal helpers
+ inline u16 register_base() const noexcept;
+ inline u16 debug_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;
+ const u16 m_iram_size;
+ 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;
+
+ // miscellaneous configuration
+ u32 m_subclock;
+
+ // core registers and execution state
+ u16 m_pc;
+ u16 m_ppc;
+ u8 m_psw;
+ u16 m_sp;
+ s32 m_icount;
+};
+
+// ======================> upd78053_device
+
+class upd78053_device : public upd78k0_device
+{
+public:
+ // device type constructors
+ upd78053_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+ template <typename X>
+ upd78053_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock, X &&subclock)
+ : upd78053_device(mconfig, tag, owner, clock)
+ {
+ set_subclock(std::forward<X>(subclock));
+ }
+
+protected:
+ // device_disasm_interface overrides
+ virtual std::unique_ptr<util::disasm_interface> create_disassembler() 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(UPD78053, upd78053_device)
+
+#endif // MAME_CPU_UPD78K_UPD78K0_H