// license:BSD-3-Clause
// copyright-holders:James Wallace
/***************************************************************************
Motorola 6840 (PTM)
Programmable Timer Module
***************************************************************************/
#ifndef MAME_MACHINE_6840PTM_H
#define MAME_MACHINE_6840PTM_H
#pragma once
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> ptm6840_device
class ptm6840_device : public device_t
{
public:
// construction/destruction
ptm6840_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
void set_external_clocks(double clock0, double clock1, double clock2) { m_external_clock[0] = clock0; m_external_clock[1] = clock1; m_external_clock[2] = clock2; }
void set_external_clocks(const XTAL &clock0, const XTAL &clock1, const XTAL &clock2) { set_external_clocks(clock0.dvalue(), clock1.dvalue(), clock2.dvalue()); }
auto o1_callback() { return m_out_cb[0].bind(); }
auto o2_callback() { return m_out_cb[1].bind(); }
auto o3_callback() { return m_out_cb[2].bind(); }
auto irq_callback() { return m_irq_cb.bind(); }
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_t 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
void write(offs_t offset, uint8_t data);
uint8_t read(offs_t offset);
void set_gate(int idx, int state);
DECLARE_WRITE_LINE_MEMBER( set_g1 ) { set_gate(0, state); }
DECLARE_WRITE_LINE_MEMBER( set_g2 ) { set_gate(1, state); }
DECLARE_WRITE_LINE_MEMBER( set_g3 ) { set_gate(2, state); }
void set_clock(int idx, int state);
DECLARE_WRITE_LINE_MEMBER( set_c1 ) { set_clock(0, state); }
DECLARE_WRITE_LINE_MEMBER( set_c2 ) { set_clock(1, state); }
DECLARE_WRITE_LINE_MEMBER( set_c3 ) { set_clock(2, state); }
void update_interrupts();
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
private:
void subtract_from_counter(int counter, int count);
void tick(int counter, int count);
void timeout(int idx);
uint16_t 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
};
enum
{
RESET_TIMERS = 0x01,
CR1_SELECT = 0x01,
T3_PRESCALE_EN = 0x01,
INTERNAL_CLK_EN = 0x02,
COUNT_MODE_8BIT = 0x04,
INTERRUPT_EN = 0x40,
COUNT_OUT_EN = 0x80
};
enum
{
TIMER1_IRQ = 0x01,
TIMER2_IRQ = 0x02,
TIMER3_IRQ = 0x04,
ANY_IRQ = 0x80
};
double m_external_clock[3];
devcb_write_line m_out_cb[3];
devcb_write_line m_irq_cb;
uint8_t m_control_reg[3];
uint8_t m_output[3]; // Output states
uint8_t m_gate[3]; // Input gate states
uint8_t m_clk[3]; // Clock states
uint8_t m_enabled[3];
uint8_t m_mode[3];
uint8_t m_fired[3];
uint8_t m_t3_divisor;
uint8_t m_t3_scaler;
uint8_t m_irq;
uint8_t m_status_reg;
uint8_t m_status_read_since_int;
uint8_t m_lsb_buffer;
uint8_t m_msb_buffer;
// Each PTM has 3 timers
emu_timer *m_timer[3];
uint16_t m_latch[3];
uint16_t m_counter[3];
static const char *const opmode[];
// set in dual 8 bit mode to indicate Output high time cycle
bool m_hightime[3];
};
// device type definition
DECLARE_DEVICE_TYPE(PTM6840, ptm6840_device)
#endif // MAME_MACHINE_6840PTM_H