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upd7810: return meaningful value when PC3 is in control mode

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When PC3 is in control mode, it acts as INT2 and external Timer Input.
INT2 may be set by connected devices through set_input_line(), so its
value can be used when reading or writing to PC3. There is currently
no code to support external timer input.
This commit is contained in:
Ramiro Polla 2014-11-04 19:47:28 +01:00
parent adffc17cf5
commit ff2a135bd3
1 changed files with 4 additions and 4 deletions
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8
src/emu/cpu/upd7810/upd7810.c
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@ -567,8 +567,8 @@ UINT8 upd7810_device::RP(offs_t port)
data = (data & ~0x02) | (m_rxd & 1 ? 0x02 : 0x00);
if (m_mcc & 0x04) /* PC2 = SCK input/output */
data = (data & ~0x04) | (m_sck & 1 ? 0x04 : 0x00);
if (m_mcc & 0x08) /* PC3 = TI input */
data = (data & ~0x08) | (m_ti & 1 ? 0x08 : 0x00);
if (m_mcc & 0x08) /* PC3 = TI/INT2 input */
data = (data & ~0x08) | (m_int2 & 1 ? 0x08 : 0x00);
if (m_mcc & 0x10) /* PC4 = TO output */
data = (data & ~0x10) | (m_to & 1 ? 0x10 : 0x00);
if (m_mcc & 0x20) /* PC5 = CI input */
@ -648,8 +648,8 @@ void upd7810_device::WP(offs_t port, UINT8 data)
data = (data & ~0x02) | (m_rxd & 1 ? 0x02 : 0x00);
if (m_mcc & 0x04) /* PC2 = SCK input/output */
data = (data & ~0x04) | (m_sck & 1 ? 0x04 : 0x00);
if (m_mcc & 0x08) /* PC3 = TI input */
data = (data & ~0x08) | (m_ti & 1 ? 0x08 : 0x00);
if (m_mcc & 0x08) /* PC3 = TI/INT2 input */
data = (data & ~0x08) | (m_int2 & 1 ? 0x08 : 0x00);
if (m_mcc & 0x10) /* PC4 = TO output */
data = (data & ~0x10) | (m_to & 1 ? 0x10 : 0x00);
if (m_mcc & 0x20) /* PC5 = CI input */