// 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 __Z80CTC_H__ #define __Z80CTC_H__ #include "cpu/z80/z80daisy.h" //************************************************************************** // DEVICE CONFIGURATION MACROS //************************************************************************** #define MCFG_Z80CTC_INTR_CB(_devcb) \ devcb = &z80ctc_device::set_intr_callback(*device, DEVCB_##_devcb); #define MCFG_Z80CTC_ZC0_CB(_devcb) \ devcb = &z80ctc_device::set_zc0_callback(*device, DEVCB_##_devcb); #define MCFG_Z80CTC_ZC1_CB(_devcb) \ devcb = &z80ctc_device::set_zc1_callback(*device, DEVCB_##_devcb); #define MCFG_Z80CTC_ZC2_CB(_devcb) \ devcb = &z80ctc_device::set_zc2_callback(*device, DEVCB_##_devcb); //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> z80ctc_device class z80ctc_device : public device_t, public device_z80daisy_interface { public: // construction/destruction z80ctc_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); template static devcb_base &set_intr_callback(device_t &device, _Object object) { return downcast(device).m_intr_cb.set_callback(object); } template static devcb_base &set_zc0_callback(device_t &device, _Object object) { return downcast(device).m_zc0_cb.set_callback(object); } template static devcb_base &set_zc1_callback(device_t &device, _Object object) { return downcast(device).m_zc1_cb.set_callback(object); } template static devcb_base &set_zc2_callback(device_t &device, _Object object) { return downcast(device).m_zc2_cb.set_callback(object); } // read/write handlers DECLARE_READ8_MEMBER( read ); DECLARE_WRITE8_MEMBER( write ); DECLARE_WRITE_LINE_MEMBER( trg0 ); DECLARE_WRITE_LINE_MEMBER( trg1 ); DECLARE_WRITE_LINE_MEMBER( trg2 ); DECLARE_WRITE_LINE_MEMBER( trg3 ); UINT16 get_channel_constant(UINT8 channel) { return m_channel[channel].m_tconst; } protected: // device-level overrides virtual void device_start() override; virtual void device_reset() 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(); // a single channel within the CTC class ctc_channel { public: ctc_channel(); void start(z80ctc_device *device, int index); void reset(); UINT8 read(); void write(UINT8 data); attotime period() const; void trigger(UINT8 data); TIMER_CALLBACK_MEMBER(timer_callback); z80ctc_device * m_device; // pointer back to our device int m_index; // our channel index 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) }; // internal state devcb_write_line m_intr_cb; // interrupt callback devcb_write_line m_zc0_cb; // channel 0 zero crossing callbacks devcb_write_line m_zc1_cb; // channel 1 zero crossing callbacks devcb_write_line m_zc2_cb; // channel 2 zero crossing callbacks devcb_write_line m_zc3_cb; // channel 3 zero crossing callbacks = NULL ? 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; #endif