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mcs51: Safer way to propagate INT0 and INT1 inputs, which also need to be active low (nw)

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This commit is contained in:
AJR 2018-04-16 15:24:35 -04:00
parent 2b2c87dfc5
commit cd8809b960
1 changed files with 3 additions and 3 deletions
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6
src/devices/cpu/mcs51/mcs51.cpp
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@ -1858,7 +1858,6 @@ void mcs51_cpu_device::execute_set_input(int irqline, int state)
{
//External Interrupt 0
case MCS51_INT0_LINE:
SET_P3((P3 &~ 4) | (state << 2));
//Line Asserted?
if (state != CLEAR_LINE) {
//Need cleared->active line transition? (Logical 1-0 Pulse on the line) - CLEAR->ASSERT Transition since INT0 active lo!
@ -1881,7 +1880,6 @@ void mcs51_cpu_device::execute_set_input(int irqline, int state)
//External Interrupt 1
case MCS51_INT1_LINE:
SET_P3((P3 &~ 8) | (state << 3));
//Line Asserted?
if (state != CLEAR_LINE) {
//Need cleared->active line transition? (Logical 1-0 Pulse on the line) - CLEAR->ASSERT Transition since INT1 active lo!
@ -2071,7 +2069,9 @@ uint8_t mcs51_cpu_device::sfr_read(size_t offset)
case ADDR_P0: return RWM ? P0 : (P0 | m_forced_inputs[0]) & m_port_in_cb[0]();
case ADDR_P1: return RWM ? P1 : (P1 | m_forced_inputs[1]) & m_port_in_cb[1]();
case ADDR_P2: return RWM ? P2 : (P2 | m_forced_inputs[2]) & m_port_in_cb[2]();
case ADDR_P3: return RWM ? P3 : (P3 | m_forced_inputs[3]) & m_port_in_cb[3]();
case ADDR_P3: return RWM ? P3 : (P3 | m_forced_inputs[3]) & m_port_in_cb[3]()
& ~(GET_BIT(m_last_line_state, MCS51_INT0_LINE) ? 4 : 0)
& ~(GET_BIT(m_last_line_state, MCS51_INT1_LINE) ? 8 : 0);
case ADDR_PSW:
case ADDR_ACC: