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// 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);
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<z80ctc_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 <int Channel> auto zc_callback() { return m_zc_cb[Channel].bind(); } // m_zc_cb[3] not supported on a standard ctc, only used for the tmpz84c015
// 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 );
u16 get_channel_constant(u8 channel) const { return m_channel[channel]->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();
// 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<z80ctc_channel_device, 4> m_channel;
};
// device type definitions
DECLARE_DEVICE_TYPE(Z80CTC, z80ctc_device)
DECLARE_DEVICE_TYPE(Z80CTC_CHANNEL, z80ctc_channel_device)
#endif // MAME_MACHINE_Z80CTC_H
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