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Diffstat (limited to 'trunk/src/emu/machine/mb3773.c')
-rw-r--r-- | trunk/src/emu/machine/mb3773.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/mb3773.c b/trunk/src/emu/machine/mb3773.c new file mode 100644 index 00000000000..925def0a33f --- /dev/null +++ b/trunk/src/emu/machine/mb3773.c @@ -0,0 +1,114 @@ +/*************************************************************************** + + 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(); +} |