/*************************************************************************** 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__ */