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// license:BSD-3-Clause
// copyright-holders:AJR
/**********************************************************************
Philips PCF8584 I²C Bus Controller
***********************************************************************
____ ____
CLK 1 |* \_/ | 20 Vdd
(SDA OUT) SDA 2 | | 19 _RESET/_STROBE
(SCL IN) SCL 3 | | 18 _WR (R/_W)
(SDA IN) _IACK 4 | | 17 _CS
(SCL OUT) _INT 5 | | 16 _RD (_DTACK)
A0 6 | PCF8584 | 15 DB7
DB0 7 | | 14 DB6
DB1 8 | | 13 DB5
DB2 9 | | 12 DB4
Vss 10 |___________| 11 DB3
**********************************************************************/
#ifndef MAME_MACHINE_PCF8584_H
#define MAME_MACHINE_PCF8584_H
#pragma once
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> pcf8584_device
class pcf8584_device : public device_t
{
static const u32 s_prescaler[4];
static const u32 s_divider[8];
static const char *const s_nominal_clock[8];
static const char *const s_bus_function[4];
public:
// device type constructor
pcf8584_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
// callback configuration
auto sda_cb() { return m_sda_callback.bind(); }
auto sda_out_cb() { return m_sda_out_callback.bind(); }
auto scl_cb() { return m_scl_callback.bind(); }
auto int_cb() { return m_int_callback.bind(); }
// bus type configuration
void set_80xx_bus() { m_68k_bus = false; }
void set_68000_bus() { m_68k_bus = true; }
// CPU interface
u8 read(offs_t offset);
void write(offs_t offset, u8 data);
IRQ_CALLBACK_MEMBER(iack);
protected:
// device-specific overrides
virtual void device_resolve_objects() override;
virtual void device_start() override;
virtual void device_reset() override;
private:
// internal helpers
bool eso() const { return BIT(m_s1_control, 6); }
bool es1() const { return BIT(m_s1_control, 5); }
bool es2() const { return BIT(m_s1_control, 4); }
bool eni() const { return BIT(m_s1_control, 3); }
// write helpers
void set_shift_register(u8 data);
void set_own_address(u8 data);
void set_control(u8 data);
void set_clock_frequency(u8 data);
void set_vector(u8 data);
// callback objects
devcb_read_line m_sda_callback;
devcb_write_line m_sda_out_callback;
devcb_write_line m_scl_callback;
devcb_write_line m_int_callback;
// misc. parameters
bool m_68k_bus;
// internal registers
u8 m_s0_data_buffer;
u8 m_s0_shift_register;
u8 m_s0_own_address;
u8 m_s1_status;
u8 m_s1_control;
u8 m_s2_clock;
u8 m_s3_vector;
};
// device type declaration
DECLARE_DEVICE_TYPE(PCF8584, pcf8584_device)
#endif // MAME_MACHINE_PCF8584_H
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