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/**********************************************************************
mm58167.c - National Semiconductor MM58167 real-time clock emulation
TODO: alarms and IRQs not used by the Apple /// and aren't implemented.
**********************************************************************/
#include "mm58167.h"
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
// device type definition
const device_type MM58167 = &device_creator<mm58167_device>;
// registers (0-7 are the live data, 8-f are the setting for the compare IRQ)
typedef enum
{
R_CNT_MILLISECONDS = 0, // 0 = milliseconds
R_CNT_HUNDTENTHS, // 1 = hundreds and tenths of seconds
R_CNT_SECONDS, // 2 = seconds
R_CNT_MINUTES, // 3 = minutes
R_CNT_HOURS, // 4 = hours
R_CNT_DAYOFWEEK, // 5 = day of the week
R_CNT_DAYOFMONTH, // 6 = day of the month
R_CNT_MONTH, // 7 = month
R_RAM_MILLISECONDS, // 8 = milliseconds
R_RAM_HUNDTENTHS, // 9 = hundreds and tenths of seconds
R_RAM_SECONDS, // a = seconds
R_RAM_MINUTES, // b = minutes
R_RAM_HOURS, // c = hours
R_RAM_DAYOFWEEK, // d = day of the week
R_RAM_DAYOFMONTH, // e = day of the month
R_RAM_MONTH, // f = month
R_CTL_IRQSTATUS, // 10 = IRQ status (b7 = compare, b6 = 10th sec, b5 = sec, b4 = min, b3 = hour, b2 = day, b1 = week, b0 = month)
R_CTL_IRQCONTROL, // 11 = IRQ control (same bit layout as status, but write here to enable/disable/clear)
R_CTL_RESETCOUNTERS, // 12 = reset counters
R_CTL_RESETRAM, // 13 = reset RAM
R_CTL_STATUS, // 14 = status bit
R_CTL_GOCMD, // 15 = GO Command
R_CTL_STANDBYIRQ, // 16 = standby IRQ
R_CTL_TESTMODE // 17 = test mode
} mm58167_regs_t;
//-------------------------------------------------
// mm58167_device - constructor
//-------------------------------------------------
mm58167_device::mm58167_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, MM58167, "National Semiconductor MM58167", tag, owner, clock, "mm58167", __FILE__),
device_rtc_interface(mconfig, *this),
m_irq_w(*this)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void mm58167_device::device_start()
{
// allocate timers
m_clock_timer = timer_alloc();
m_clock_timer->adjust(attotime::from_hz(clock() / 32.768f), 0, attotime::from_hz(clock() / 32.768f));
m_irq_w.resolve_safe();
// state saving
save_item(NAME(m_regs));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void mm58167_device::device_reset()
{
set_current_time(machine());
m_regs[R_CTL_STATUS] = 0; // not busy
m_milliseconds = 0;
}
INLINE UINT8 make_bcd(UINT8 data)
{
return ((data / 10) << 4) | (data % 10);
}
//-------------------------------------------------
// device_timer - handler timer events
//-------------------------------------------------
void mm58167_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
m_milliseconds++;
if (m_milliseconds >= 999)
{
advance_seconds();
m_milliseconds = 0;
}
m_regs[R_CNT_MILLISECONDS] = make_bcd(m_milliseconds % 10);
m_regs[R_CNT_HUNDTENTHS] = make_bcd(m_milliseconds / 10);
}
//-------------------------------------------------
// rtc_clock_updated -
//-------------------------------------------------
void mm58167_device::rtc_clock_updated(int year, int month, int day, int day_of_week, int hour, int minute, int second)
{
m_regs[R_CNT_SECONDS] = make_bcd(second); // seconds (BCD)
m_regs[R_CNT_MINUTES] = make_bcd(minute); // minutes (BCD)
m_regs[R_CNT_HOURS] = make_bcd(hour); // hour (BCD)
m_regs[R_CNT_DAYOFWEEK] = make_bcd(day_of_week); // day of the week (BCD)
m_regs[R_CNT_DAYOFMONTH] = make_bcd(day); // day of the month (BCD)
m_regs[R_CNT_MONTH] = make_bcd(month); // month (BCD)
}
READ8_MEMBER(mm58167_device::read)
{
// printf("read reg %x = %02x\n", offset, m_regs[offset]);
return m_regs[offset];
}
WRITE8_MEMBER(mm58167_device::write)
{
// printf("%02x to reg %x\n", data, offset);
if ((offset >= R_RAM_MILLISECONDS) && (offset != R_CTL_IRQSTATUS))
{
m_regs[offset] = data;
}
switch (offset)
{
// any write to this starts at the current time and zero milliseconds
case R_CTL_GOCMD:
m_milliseconds = 0;
break;
case R_CTL_RESETRAM:
if (data == 0xff)
{
for (int i = R_RAM_MILLISECONDS; i < R_CTL_IRQSTATUS; i++)
{
m_regs[i] = 0;
}
}
break;
case R_CTL_IRQCONTROL:
if (data != 0)
{
logerror("MM58167: IRQs not implemented\n");
}
break;
}
}
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