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-6840ptm: Fixed a couple of issues related to the T3 divisor.

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This commit is contained in:
Ryan Holtz 2020-06-29 15:31:59 +02:00
parent 8e9a389486
commit 81b58a6002
1 changed files with 9 additions and 7 deletions
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16
src/devices/machine/6840ptm.cpp
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@ -324,17 +324,18 @@ uint16_t ptm6840_device::compute_counter( int counter ) const
if (m_control_reg[counter] & INTERNAL_CLK_EN)
{
clk = static_cast<double>(clock());
LOGMASKED(LOG_COUNTERS, "Timer #%d internal clock freq %f \n", counter + 1, clk);
}
else
{
clk = m_external_clock[counter];
if (counter == 2)
{
clk /= m_t3_divisor;
}
LOGMASKED(LOG_COUNTERS, "Timer #%d external clock freq %f \n", counter + 1, clk);
}
if (counter == 2)
{
clk /= m_t3_divisor;
}
LOGMASKED(LOG_COUNTERS, "Timer #%d %s clock freq %f \n", counter + 1, (m_control_reg[counter] & INTERNAL_CLK_EN) ? "internal" : "external", clk);
// See how many are left
int remaining = (m_timer[counter]->remaining() * clk).as_double();
@ -346,6 +347,7 @@ uint16_t ptm6840_device::compute_counter( int counter ) const
int lsb = remaining % divisor;
remaining = (msb << 8) | lsb;
}
LOGMASKED(LOG_COUNTERS, "Timer #%d read counter: %d\n", counter + 1, remaining);
return remaining;
}
@ -506,9 +508,9 @@ void ptm6840_device::write(offs_t offset, uint8_t data)
{
int idx = (offset == 1) ? 1 : (m_control_reg[1] & CR1_SELECT) ? 0 : 2;
uint8_t diffs = data ^ m_control_reg[idx];
m_t3_divisor = (m_control_reg[2] & T3_PRESCALE_EN) ? 8 : 1;
m_mode[idx] = (data >> 3) & 0x07;
m_control_reg[idx] = data;
m_t3_divisor = (m_control_reg[2] & T3_PRESCALE_EN) ? 8 : 1;
LOGMASKED(LOG_CONTROL, "Control register #%d selected\n", idx + 1);
LOGMASKED(LOG_CONTROL, "operation mode = %s\n", opmode[m_mode[idx]]);