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z8: Handle more timer corner cases (nw)

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This commit is contained in:
AJR 2019-01-18 08:34:18 -05:00
parent 830f9927f1
commit adcf8c82a2
1 changed files with 17 additions and 1 deletions
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18
src/devices/cpu/z8/z8.cpp
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@ -684,12 +684,28 @@ void z8_device::t1_write(uint8_t data)
void z8_device::pre0_write(uint8_t data)
{
m_pre[0] = data;
if (m_internal_timer[0]->enabled())
{
timer_stop<0>();
m_pre[0] = data;
timer_start<0>();
}
else
m_pre[0] = data;
}
void z8_device::pre1_write(uint8_t data)
{
bool was_enabled = m_internal_timer[1]->enabled();
if (was_enabled)
timer_stop<1>();
m_pre[1] = data;
if ((data & Z8_PRE1_INTERNAL_CLOCK) != 0
? (m_tmr & Z8_TMR_ENABLE_T1) != 0
: was_enabled && (m_tmr & Z8_TMR_TIN_MASK) != Z8_TMR_TIN_EXTERNAL_CLK)
timer_start<1>();
}
void z8_device::p01m_write(uint8_t data)