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// license:BSD-3-Clause
// copyright-holders:smf
/***************************************************************************
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"
#define WATCHDOG_DEBUG ( 0 )
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
// device type definition
DEFINE_DEVICE_TYPE(MB3773, mb3773_device, "mb3773", "MB3773 Power Supply Monitor")
//-------------------------------------------------
// mb3773_device - constructor
//-------------------------------------------------
mb3773_device::mb3773_device( const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock )
: device_t(mconfig, MB3773, tag, owner, clock), m_watchdog_timer(nullptr), m_ck(0)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void mb3773_device::device_start()
{
m_watchdog_timer = timer_alloc(FUNC(mb3773_device::watchdog_expired), this);
save_item( NAME(m_ck) );
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void mb3773_device::device_reset()
{
reset_timer();
}
TIMER_CALLBACK_MEMBER(mb3773_device::watchdog_expired)
{
logerror("Reset caused by watchdog\n");
#if WATCHDOG_DEBUG
machine().debug_break();
#else
machine().schedule_soft_reset();
#endif
}
void mb3773_device::reset_timer()
{
m_watchdog_timer->adjust( attotime::from_seconds( 5 ) );
}
WRITE_LINE_MEMBER( mb3773_device::write_line_ck )
{
if( state == 0 && m_ck != 0 )
{
reset_timer();
}
m_ck = state;
}
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