// 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