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// license:BSD-3-Clause
// copyright-holders:AJR
/****************************************************************************
Fairchild 4702B Programmable Bit Rate Generator
*****************************************************************************
____ ____
Q0 1 |* \_/ | 16 Vdd
Q1 2 | | 15 Im
Q2 3 | | 14 S0
_Ecp 4 | | 13 S1
CP 5 | 4702BPC | 12 S2
Ox 6 | | 11 S3
Ix 7 | | 10 Z
Vss 8 |___________| 9 CO
****************************************************************************/
#ifndef MAME_MACHINE_F4702_H
#define MAME_MACHINE_F4702_H
#pragma once
// ======================> f4702_device
class f4702_device : public device_t, public device_execute_interface
{
public:
f4702_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
// callback configuration
auto s_callback() { return m_s_callback.bind(); }
auto z_callback() { return m_z_callback.bind(); }
// external rate input
DECLARE_WRITE_LINE_MEMBER(im_w);
// reset control (optional)
void reset_counters();
protected:
// device-level overrides
virtual void device_resolve_objects() override;
virtual void device_start() override;
// device_execute_interface overrides
virtual void execute_run() override;
private:
// internal helpers
bool z_output() const;
// input & output callbacks
devcb_read8 m_s_callback;
devcb_write8 m_z_callback;
// internal counters
u16 m_main_counter;
u8 m_div_200_50;
u8 m_div_134_5;
u8 m_div_110;
u8 m_div_1800;
// miscellaneous state
bool m_im;
u8 m_s;
s32 m_icount;
};
// device type declaration
DECLARE_DEVICE_TYPE(F4702, f4702_device)
#endif // MAME_MACHINE_F4702_H
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