// license:BSD-3-Clause // copyright-holders:James Wallace /*************************************************************************** Motorola 6840 (PTM) Programmable Timer Module ***************************************************************************/ #pragma once #ifndef __6840PTM_H__ #define __6840PTM_H__ //************************************************************************** // DEVICE CONFIGURATION MACROS //************************************************************************** #define MCFG_PTM6840_EXTERNAL_CLOCKS(_clk0, _clk1, _clk2) \ ptm6840_device::set_external_clocks(*device, _clk0, _clk1, _clk2); #define MCFG_PTM6840_OUT0_CB(_devcb) \ devcb = &ptm6840_device::set_out_callback(*device, 0, DEVCB_##_devcb); #define MCFG_PTM6840_OUT1_CB(_devcb) \ devcb = &ptm6840_device::set_out_callback(*device, 1, DEVCB_##_devcb); #define MCFG_PTM6840_OUT2_CB(_devcb) \ devcb = &ptm6840_device::set_out_callback(*device, 2, DEVCB_##_devcb); #define MCFG_PTM6840_IRQ_CB(_devcb) \ devcb = &ptm6840_device::set_irq_callback(*device, DEVCB_##_devcb); //************************************************************************** // 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); static void set_external_clocks(device_t &device, double clock0, double clock1, double clock2) { downcast(device).m_external_clock[0] = clock0; downcast(device).m_external_clock[1] = clock1; downcast(device).m_external_clock[2] = clock2; } template static devcb_base &set_out_callback(device_t &device, int index, _Object object) { return downcast(device).m_out_cb[index].set_callback(object); } template static devcb_base &set_irq_callback(device_t &device, _Object object) { return downcast(device).m_irq_cb.set_callback(object); } 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 DECLARE_WRITE8_MEMBER( write ); void write(offs_t offset, uint8_t data) { write(machine().dummy_space(), offset, data); } DECLARE_READ8_MEMBER( read ); uint8_t read(offs_t offset) { return read(machine().dummy_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() 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[]; }; // device type definition extern const device_type PTM6840; #endif /* __6840PTM_H__ */