Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-05-24 14:56:21 +03:00
Code Issues Actions 7 Packages Projects Releases Wiki Activity

upd7810: ECNT clear control happens after capture control

Browse Source
This commit is contained in:
Ramiro Polla 2014-11-05 15:10:40 +01:00
parent ef53b9356f
commit 613ad8165d
1 changed files with 16 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
src/emu/cpu/upd7810/upd7810.c
View File

@ -1313,22 +1313,6 @@ void upd7810_device::handle_timers(int cycles)
IRR |= INTFE0; IRR |= INTFE0;
if (ETM1 == ECNT) if (ETM1 == ECNT)
IRR |= INTFE1; IRR |= INTFE1;
/* How and When ECNT is Cleared */
switch (ETMM & 0x0c)
{
case 0x00: /* clear ECNT */
break;
case 0x04: /* free running */
if (0 == ECNT)
ITF |= INTOV; /* set overflow flag if counter wrapped */
break;
case 0x08: /* reset at falling edge of CI or TO */
break;
case 0x0c: /* reset if ECNT == ETM1 */
if (ETM1 == ECNT)
ECNT = 0;
break;
}
/* Conditions When ECNT Causes a CO0 Output Change */ /* Conditions When ECNT Causes a CO0 Output Change */
if (((0x00 == (ETMM & 0x30)) && (ETM0 == ECNT)) || /* set CO0 if ECNT == ETM0 */ if (((0x00 == (ETMM & 0x30)) && (ETM0 == ECNT)) || /* set CO0 if ECNT == ETM0 */
/* ((0x10 == (ETMM & 0x30)) prohibited */ /* ((0x10 == (ETMM & 0x30)) prohibited */
@ -1367,6 +1351,22 @@ void upd7810_device::handle_timers(int cycles)
break; break;
} }
} }
/* How and When ECNT is Cleared */
switch (ETMM & 0x0c)
{
case 0x00: /* clear ECNT */
break;
case 0x04: /* free running */
if (0 == ECNT)
ITF |= INTOV; /* set overflow flag if counter wrapped */
break;
case 0x08: /* reset at falling edge of CI or TO */
break;
case 0x0c: /* reset if ECNT == ETM1 */
if (ETM1 == ECNT)
ECNT = 0;
break;
}
} }
} }