/*************************************************************************** Z80 CTC (Z8430) implementation Copyright Nicola Salmoria and the MAME Team. Visit http://mamedev.org for licensing and usage restrictions. **************************************************************************** _____ _____ D4 1 |* \_/ | 28 D3 D5 2 | | 27 D2 D6 3 | | 26 D1 D7 4 | | 25 D0 GND 5 | | 24 +5V _RD 6 | | 23 CLK/TRG0 ZC/TOO 7 | Z80-CTC | 22 CLK/TRG1 ZC/TO1 8 | | 21 CLK/TRG2 ZC/TO2 9 | | 20 CLK/TRG3 _IORQ 10 | | 19 CS1 IEO 11 | | 18 CS0 _INT 12 | | 17 _RESET IEI 13 | | 16 _CE _M1 14 |_____________| 15 CLK ***************************************************************************/ #ifndef __Z80CTC_H__ #define __Z80CTC_H__ #include "cpu/z80/z80daisy.h" //************************************************************************** // CONSTANTS //************************************************************************** const int NOTIMER_0 = (1<<0); const int NOTIMER_1 = (1<<1); const int NOTIMER_2 = (1<<2); const int NOTIMER_3 = (1<<3); //************************************************************************** // DEVICE CONFIGURATION MACROS //************************************************************************** #define Z80CTC_INTERFACE(name) \ const z80ctc_interface (name)= #define MCFG_Z80CTC_ADD(_tag, _clock, _intrf) \ MCFG_DEVICE_ADD(_tag, Z80CTC, _clock) \ MCFG_DEVICE_CONFIG(_intrf) //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> z80ctc_interface struct z80ctc_interface { UINT8 m_notimer; // timer disabler mask devcb_write_line m_intr; // callback when change interrupt status devcb_write_line m_zc0; // ZC/TO0 callback devcb_write_line m_zc1; // ZC/TO1 callback devcb_write_line m_zc2; // ZC/TO2 callback }; // ======================> z80ctc_device_config class z80ctc_device_config : public device_config, public device_config_z80daisy_interface, public z80ctc_interface { friend class z80ctc_device; // construction/destruction z80ctc_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock); public: // allocators static device_config *static_alloc_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock); virtual device_t *alloc_device(running_machine &machine) const; protected: // device_config overrides virtual void device_config_complete(); }; // ======================> z80ctc_device class z80ctc_device : public device_t, public device_z80daisy_interface { friend class z80ctc_device_config; // construction/destruction z80ctc_device(running_machine &_machine, const z80ctc_device_config &_config); public: // state getters attotime period(int ch) const { return m_channel[ch].period(); } // I/O operations UINT8 read(int ch) { return m_channel[ch].read(); } void write(int ch, UINT8 data) { m_channel[ch].write(data); } void trigger(int ch, UINT8 data) { m_channel[ch].trigger(data); } private: // device-level overrides virtual void device_start(); virtual void device_reset(); // z80daisy_interface overrides virtual int z80daisy_irq_state(); virtual int z80daisy_irq_ack(); virtual void z80daisy_irq_reti(); // internal helpers void interrupt_check(); void timercallback(int chanindex); // a single channel within the CTC class ctc_channel { public: ctc_channel(); void start(z80ctc_device *device, int index, bool notimer, const devcb_write_line *write_line); void reset(); UINT8 read(); void write(UINT8 data); attotime period() const; void trigger(UINT8 data); void timer_callback(); z80ctc_device * m_device; // pointer back to our device int m_index; // our channel index devcb_resolved_write_line m_zc; // zero crossing callbacks bool m_notimer; // timer disabled? UINT16 m_mode; // current mode UINT16 m_tconst; // time constant UINT16 m_down; // down counter (clock mode only) UINT8 m_extclk; // current signal from the external clock emu_timer * m_timer; // array of active timers UINT8 m_int_state; // interrupt status (for daisy chain) private: static TIMER_CALLBACK( static_timer_callback ) { reinterpret_cast(ptr)->timer_callback(); } }; // internal state const z80ctc_device_config &m_config; devcb_resolved_write_line m_intr; // interrupt callback UINT8 m_vector; // interrupt vector attotime m_period16; // 16/system clock attotime m_period256; // 256/system clock ctc_channel m_channel[4]; // data for each channel }; // device type definition extern const device_type Z80CTC; //************************************************************************** // READ/WRITE HANDLERS //************************************************************************** WRITE8_DEVICE_HANDLER( z80ctc_w ); READ8_DEVICE_HANDLER( z80ctc_r ); WRITE_LINE_DEVICE_HANDLER( z80ctc_trg0_w ); WRITE_LINE_DEVICE_HANDLER( z80ctc_trg1_w ); WRITE_LINE_DEVICE_HANDLER( z80ctc_trg2_w ); WRITE_LINE_DEVICE_HANDLER( z80ctc_trg3_w ); #endif