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Diffstat (limited to 'trunk/src/emu/machine/6551acia.h')
-rw-r--r-- | trunk/src/emu/machine/6551acia.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/6551acia.h b/trunk/src/emu/machine/6551acia.h new file mode 100644 index 00000000000..ce09c0f1420 --- /dev/null +++ b/trunk/src/emu/machine/6551acia.h @@ -0,0 +1,65 @@ +/********************************************************************* + + 6551.h + + MOS Technology 6551 Asynchronous Communications Interface Adapter + +*********************************************************************/ + +#ifndef __6551_H__ +#define __6551_H__ + +//************************************************************************** +// INTERFACE CONFIGURATION MACROS +//************************************************************************** + +#define MCFG_ACIA6551_ADD(_tag) \ + MCFG_DEVICE_ADD((_tag), ACIA6551, 0) + + +/*************************************************************************** + TYPE DEFINITIONS +***************************************************************************/ + +// ======================> acia6551_device + +class acia6551_device : public device_t, + public device_serial_interface +{ +public: + // construction/destruction + acia6551_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + + /* read data register */ + DECLARE_READ8_MEMBER(read); + + /* write data register */ + DECLARE_WRITE8_MEMBER(write); + + void receive_character(UINT8 ch); + + void timer_callback(); + + virtual void input_callback(UINT8 state); +protected: + // device-level overrides + virtual void device_start(); + + void refresh_ints(); + void update_data_form(); + +private: + UINT8 m_transmit_data_register; + UINT8 m_receive_data_register; + UINT8 m_status_register; + UINT8 m_command_register; + UINT8 m_control_register; + + /* internal baud rate timer */ + emu_timer *m_timer; +}; + +// device type definition +extern const device_type ACIA6551; + +#endif /* __6551_H__ */ |