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/***************************************************************************
Fujitsu MB3773
Power Supply Monitor with Watch Dog Timer (i.e. Reset IC)
Todo:
Calculate the timeout from parameters.
***************************************************************************/
#include "emu.h"
#include "mb3773.h"
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
// device type definition
const device_type MB3773 = &device_creator<mb3773_device>;
//-------------------------------------------------
// mb3773_device - constructor
//-------------------------------------------------
mb3773_device::mb3773_device( const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock )
: device_t(mconfig, MB3773, "MB3773", tag, owner, clock)
{
}
//-------------------------------------------------
// device_config_complete - perform any
// operations now that the configuration is
// complete
//-------------------------------------------------
void mb3773_device::device_config_complete()
{
}
//-------------------------------------------------
// device_validity_check - perform validity checks
// on this device
//-------------------------------------------------
bool mb3773_device::device_validity_check( emu_options &options, const game_driver &driver ) const
{
return false;
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void mb3773_device::device_start()
{
m_watchdog_timer = machine().scheduler().timer_alloc( FUNC(watchdog_timeout), this );
reset_timer();
save_item( NAME(m_ck) );
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void mb3773_device::device_reset()
{
m_ck = 0;
}
//**************************************************************************
// READ/WRITE HANDLERS
//**************************************************************************
WRITE_LINE_DEVICE_HANDLER( mb3773_set_ck )
{
downcast<mb3773_device *>( device )->set_ck( state );
}
void mb3773_device::set_ck( int state )
{
state &= 1;
if( state == 0 && m_ck != 0 )
{
reset_timer();
}
m_ck = state;
}
//**************************************************************************
// INTERNAL HELPERS
//**************************************************************************
void mb3773_device::reset_timer()
{
m_watchdog_timer->adjust( attotime::from_seconds( 5 ) );
}
TIMER_CALLBACK( mb3773_device::watchdog_timeout )
{
reinterpret_cast<mb3773_device *>(ptr)->machine().schedule_soft_reset();
}
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