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// license:BSD-3-Clause
// copyright-holders:AJR
/**********************************************************************
EM Microelectronic-Marin (µem) M 3002 Real Time Clock
***********************************************************************
____ ____
Vbb 1 |* \__/ | 16 Vdd
XI 2 | | 15 _PULSE
XO 3 | | 14 _BUSY
_SYNC 4 | | 13 _IRQ
R/_W 5 | M 3002 | 12 I/O 3
_OE 6 | | 11 I/O 2
_CS 7 | | 10 I/O 1
Vss 8 |____________| 9 I/O 0
**********************************************************************/
#ifndef MAME_MACHINE_M3002_H
#define MAME_MACHINE_M3002_H
#pragma once
#include "dirtc.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> m3002_device
class m3002_device : public device_t, public device_nvram_interface, public device_rtc_interface
{
public:
// device type constructor
m3002_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock);
auto irq_out() { return m_irq_callback.bind(); }
// 4-bit read/write handlers
u8 read();
void write(u8 data);
// status output polling
DECLARE_READ_LINE_MEMBER(busy_r) { return internal_busy() ? 0 : 1; }
DECLARE_READ_LINE_MEMBER(irq_r) { return m_irq_active ? 0 : 1; }
protected:
m3002_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, const XTAL &clock);
// device-level overrides
virtual void device_resolve_objects() override;
virtual void device_start() override;
virtual void device_clock_changed() override;
// device_nvram_interface overrides
virtual bool nvram_read(util::read_stream &file) override;
virtual bool nvram_write(util::write_stream &file) override;
virtual void nvram_default() override;
// device_rtc_interface overrides
virtual bool rtc_feature_y2k() const override { return false; }
virtual bool rtc_feature_leap_year() const override { return true; }
virtual void rtc_clock_updated(int year, int month, int day, int day_of_week, int hour, int minute, int second) override;
private:
static const char *const s_register_names[0x10];
enum class mux_state : u8
{
INIT,
TENS,
UNITS
};
// internal helpers
bool internal_busy() const;
void bcd_increment(u8 location);
u8 max_date() const;
void watch_update();
void alarm_update();
void timer_update();
void irq_update();
void update();
TIMER_CALLBACK_MEMBER(second_timer);
void set_init_state();
// callback objects
devcb_write_line m_irq_callback;
// internal state
u8 m_ram[16];
u8 m_address;
mux_state m_mux_state;
bool m_irq_active;
bool m_update_deferred;
emu_timer *m_second_timer;
};
// ======================> m3000_device
class m3000_device : public m3002_device
{
public:
// device type constructor
m3000_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock);
};
// device type declarations
DECLARE_DEVICE_TYPE(M3002, m3002_device)
DECLARE_DEVICE_TYPE(M3000, m3000_device)
#endif // MAME_MACHINE_M3002_H
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