WRITE8_DEVICE_HANDLER_TRAMPOLINE(f3853, f3853_w)
{
switch(offset)
{
case 0:
m_high = data;
break;
case 1:
m_low = data;
break;
case 2: //interrupt control
m_external_enable = ((data & 3) == 1);
m_timer_enable = ((data & 3) == 3);
f3853_set_interrupt_request_line();
break;
case 3: //timer
m_request_flipflop = FALSE;
f3853_set_interrupt_request_line();
f3853_timer_start(data);
break;
}
}
static void f3853_timer_callback(int param)
{
if (f3853.timer_enable)
{
f3853.request_flipflop = TRUE;
f3853_set_interrupt_request_line();
}
f3853_timer_start(0xfe);
}
void f3853_device::f3853_timer()
{
if(m_timer_enable)
{
m_request_flipflop = TRUE;
f3853_set_interrupt_request_line();
}
f3853_timer_start(0xfe);
}
static TIMER_CALLBACK( f3853_timer_callback )
{
running_device *device = (running_device *)ptr;
f3853_t *f3853 = get_safe_token( device );
if (f3853->timer_enable)
{
f3853->request_flipflop = TRUE;
f3853_set_interrupt_request_line( device );
}
f3853_timer_start( device, 0xfe);
}