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z80ctc: Minor clock cleanup (nw)

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This commit is contained in:
AJR 2017-05-25 11:32:59 -04:00
parent 84456ebe15
commit 9422e167ca
2 changed files with 2 additions and 7 deletions
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7
src/devices/machine/z80ctc.cpp
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@ -128,9 +128,6 @@ WRITE_LINE_MEMBER( z80ctc_device::trg3 ) { m_channel[3].trigger(state); }
void z80ctc_device::device_start()
{
m_period16 = attotime::from_hz(m_clock) * 16;
m_period256 = attotime::from_hz(m_clock) * 256;
// resolve callbacks
m_intr_cb.resolve_safe();
m_zc0_cb.resolve_safe();
@ -345,7 +342,7 @@ attotime z80ctc_device::ctc_channel::period() const
}
// compute the period
attotime period = ((m_mode & PRESCALER) == PRESCALER_16) ? m_device->m_period16 : m_device->m_period256;
attotime period = m_device->clocks_to_attotime((m_mode & PRESCALER) == PRESCALER_16 ? 16 : 256);
return period * m_tconst;
}
@ -363,7 +360,7 @@ uint8_t z80ctc_device::ctc_channel::read()
// else compute the down counter value
else
{
attotime period = ((m_mode & PRESCALER) == PRESCALER_16) ? m_device->m_period16 : m_device->m_period256;
attotime period = m_device->clocks_to_attotime((m_mode & PRESCALER) == PRESCALER_16 ? 16 : 256);
VPRINTF_CHANNEL(("CTC clock %f\n",ATTOSECONDS_TO_HZ(period.attoseconds())));

2
src/devices/machine/z80ctc.h
View File

@ -125,8 +125,6 @@ private:
devcb_write_line m_zc3_cb; // channel 3 zero crossing callbacks = nullptr ?
uint8_t m_vector; // interrupt vector
attotime m_period16; // 16/system clock
attotime m_period256; // 256/system clock
ctc_channel m_channel[4]; // data for each channel
};