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/***************************************************************************
Motorola 6840 (PTM)
Programmable Timer Module
***************************************************************************/
#pragma once
#ifndef __6840PTM_H__
#define __6840PTM_H__
#include "emu.h"
//**************************************************************************
// DEVICE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_PTM6840_ADD(_tag, _interface) \
MCFG_DEVICE_ADD(_tag, PTM6840, 0) \
ptm6840_device::static_set_interface(*device, _interface);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> ptm6840_interface
struct ptm6840_interface
{
double m_internal_clock;
double m_external_clock[3];
devcb_write8 m_out_cb[3]; // function to call when output[idx] changes
devcb_write_line m_irq_cb; // function called if IRQ line changes
};
// ======================> ptm6840_device
class ptm6840_device : public device_t,
public ptm6840_interface
{
public:
// construction/destruction
ptm6840_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
// static configuration helpers
static void static_set_interface(device_t &device, const ptm6840_interface &interface);
int status(int clock) const { return m_enabled[clock]; } // get whether timer is enabled
int irq_state() const { return m_IRQ; } // get IRQ state
UINT16 count(int counter) const { return compute_counter(counter); } // get counter value
void set_ext_clock(int counter, double clock); // set clock frequency
int ext_clock(int counter) const { return m_external_clock[counter]; } // get clock frequency
DECLARE_WRITE8_MEMBER( write );
void write(offs_t offset, UINT8 data) { write(machine().driver_data()->generic_space(), offset, data); }
DECLARE_READ8_MEMBER( read );
UINT8 read(offs_t offset) { return read(machine().driver_data()->generic_space(), offset); }
void set_gate(int idx, int state);
DECLARE_WRITE_LINE_MEMBER( set_g1 );
DECLARE_WRITE_LINE_MEMBER( set_g2 );
DECLARE_WRITE_LINE_MEMBER( set_g3 );
void set_clock(int idx, int state);
DECLARE_WRITE_LINE_MEMBER( set_c1 );
DECLARE_WRITE_LINE_MEMBER( set_c2 );
DECLARE_WRITE_LINE_MEMBER( set_c3 );
void update_interrupts();
protected:
// device-level overrides
virtual void device_start();
virtual void device_reset();
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
private:
void subtract_from_counter(int counter, int count);
void tick(int counter, int count);
void timeout(int idx);
UINT16 compute_counter(int counter) const;
void reload_count(int idx);
enum
{
PTM_6840_CTRL1 = 0,
PTM_6840_CTRL2 = 1,
PTM_6840_STATUS = 1,
PTM_6840_MSBBUF1 = 2,
PTM_6840_LSB1 = 3,
PTM_6840_MSBBUF2 = 4,
PTM_6840_LSB2 = 5,
PTM_6840_MSBBUF3 = 6,
PTM_6840_LSB3 = 7,
};
devcb_resolved_write8 m_out_func[3]; // function to call when output[idx] changes
devcb_resolved_write_line m_irq_func; // function called if IRQ line changes
UINT8 m_control_reg[3];
UINT8 m_output[3]; // Output states
UINT8 m_gate[3]; // Input gate states
UINT8 m_clk[3]; // Clock states
UINT8 m_enabled[3];
UINT8 m_mode[3];
UINT8 m_fired[3];
UINT8 m_t3_divisor;
UINT8 m_t3_scaler;
UINT8 m_IRQ;
UINT8 m_status_reg;
UINT8 m_status_read_since_int;
UINT8 m_lsb_buffer;
UINT8 m_msb_buffer;
// Each PTM has 3 timers
emu_timer *m_timer[3];
UINT16 m_latch[3];
UINT16 m_counter[3];
static const char *const opmode[];
};
// device type definition
extern const device_type PTM6840;
#endif /* __6840PTM_H__ */
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