// license:BSD-3-Clause // copyright-holders:Wilbert Pol /*************************************************************************** Z80 CTC (Z8430) implementation **************************************************************************** _____ _____ 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 MAME_MACHINE_Z80CTC_H #define MAME_MACHINE_Z80CTC_H #pragma once #include "machine/z80daisy.h" //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // forward declaration class z80ctc_device; // ======================> z80ctc_channel_device // a single channel within the CTC class z80ctc_channel_device : public device_t { friend class z80ctc_device; public: // construction/destruction z80ctc_channel_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0); protected: // device-level overrides virtual void device_start() override; virtual void device_reset() override; u8 read(); void write(u8 data); attotime period() const; void trigger(bool state); TIMER_CALLBACK_MEMBER(timer_callback); required_device m_device; // pointer back to our device int m_index; // our channel index u16 m_mode; // current mode u16 m_tconst; // time constant u16 m_down; // down counter (clock mode only) bool m_extclk; // current signal from the external clock emu_timer * m_timer; // array of active timers u8 m_int_state; // interrupt status (for daisy chain) }; // ======================> z80ctc_device class z80ctc_device : public device_t, public device_z80daisy_interface { friend class z80ctc_channel_device; public: // construction/destruction z80ctc_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); auto intr_callback() { return m_intr_cb.bind(); } template auto zc_callback() { return m_zc_cb[Channel].bind(); } // m_zc_cb[3] not supported on a standard ctc, only used for the tmpz84c015 template void set_clk(u32 clock) { channel_config(Channel).set_clock(clock); } template void set_clk(const XTAL &xtal) { channel_config(Channel).set_clock(xtal); } // read/write handlers uint8_t read(offs_t offset); void write(offs_t offset, uint8_t data); DECLARE_WRITE_LINE_MEMBER( trg0 ); DECLARE_WRITE_LINE_MEMBER( trg1 ); DECLARE_WRITE_LINE_MEMBER( trg2 ); DECLARE_WRITE_LINE_MEMBER( trg3 ); u16 get_channel_constant(int ch) const { return m_channel[ch]->m_tconst; } protected: // device-level overrides virtual void device_add_mconfig(machine_config &config) override; virtual void device_resolve_objects() override; virtual void device_start() override; virtual void device_reset_after_children() override; // z80daisy_interface overrides virtual int z80daisy_irq_state() override; virtual int z80daisy_irq_ack() override; virtual void z80daisy_irq_reti() override; private: // internal helpers void interrupt_check(); z80ctc_channel_device &channel_config(int ch) { return *subdevice(m_channel[ch].finder_tag()); } // internal state devcb_write_line m_intr_cb; // interrupt callback devcb_write_line m_zc_cb[4]; // zero crossing/timer output callbacks u8 m_vector; // interrupt vector // subdevice for each channel required_device_array m_channel; }; // device type definitions DECLARE_DEVICE_TYPE(Z80CTC, z80ctc_device) DECLARE_DEVICE_TYPE(Z80CTC_CHANNEL, z80ctc_channel_device) #endif // MAME_MACHINE_Z80CTC_H