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Fixed MCCS1850 read/write. (nw)

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This commit is contained in:
Curt Coder 2011-05-02 22:02:37 +00:00
parent c4c2a1655e
commit a5a153d114
1 changed files with 14 additions and 6 deletions
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20
src/emu/machine/mccs1850.c
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@ -284,7 +284,7 @@ mccs1850_device::mccs1850_device(const machine_config &mconfig, const char *tag,
m_pse(1),
m_ce(0),
m_sck(0),
m_sdo(0),
m_sdo(1),
m_sdi(0),
m_state(STATE_ADDRESS),
m_bits(0)
@ -450,12 +450,12 @@ WRITE_LINE_MEMBER( mccs1850_device::sck_w )
if (m_bits == 8)
{
if (LOG) logerror("MCCS1850 '%s' %s Address %u\n", tag(), BIT(m_address, 7) ? "Read" : "Write", m_address & 0x7f);
if (LOG) logerror("MCCS1850 '%s' %s Address %u\n", tag(), BIT(m_address, 7) ? "Write" : "Read", m_address & 0x7f);
m_bits = 0;
m_state = STATE_DATA;
if (BIT(m_address, 7))
if (!BIT(m_address, 7))
{
m_shift = read_register(m_address & 0x7f);
@ -466,7 +466,7 @@ WRITE_LINE_MEMBER( mccs1850_device::sck_w )
break;
case STATE_DATA:
if (!BIT(m_address, 7) && m_sck && !state)
if (BIT(m_address, 7) && m_sck && !state)
{
// shift data in
m_shift <<= 1;
@ -486,7 +486,7 @@ WRITE_LINE_MEMBER( mccs1850_device::sck_w )
m_address &= 0x7f;
}
}
else if (BIT(m_address, 7) && !m_sck && state)
else if (!BIT(m_address, 7) && !m_sck && state)
{
// shift data out
m_sdo = BIT(m_shift, 7);
@ -516,7 +516,15 @@ WRITE_LINE_MEMBER( mccs1850_device::sck_w )
READ_LINE_MEMBER( mccs1850_device::sdo_r )
{
return m_sdo;
if (!m_ce || BIT(m_address, 7))
{
// Hi-Z
return 1;
}
else
{
return m_sdo;
}
}