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-rw-r--r--src/devices/machine/mb3773.cpp76
1 files changed, 76 insertions, 0 deletions
diff --git a/src/devices/machine/mb3773.cpp b/src/devices/machine/mb3773.cpp
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+++ b/src/devices/machine/mb3773.cpp
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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"
+
+
+//**************************************************************************
+// 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 Power Supply Monitor", tag, owner, clock, "mb3773", __FILE__)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void mb3773_device::device_start()
+{
+ m_watchdog_timer = timer_alloc();
+ reset_timer();
+
+ save_item( NAME(m_ck) );
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void mb3773_device::device_reset()
+{
+ m_ck = 0;
+}
+
+void mb3773_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+ machine().schedule_soft_reset();
+}
+
+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;
+}