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mcs48: mcu reset sets bus to hi-z if ea=0

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This commit is contained in:
hap 2024-08-13 14:45:02 +02:00
parent 89af2ffaa9
commit 76323a8fd1
1 changed files with 14 additions and 8 deletions
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22
src/devices/cpu/mcs48/mcs48.cpp
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@ -1207,12 +1207,7 @@ void mcs48_cpu_device::device_reset()
update_regptr();
m_f1 = false;
m_a11 = 0;
m_dbbo = 0xff;
bus_w(0xff);
m_p1 = 0xff;
m_p2 = 0xff;
port_w(1, m_p1);
port_w(2, m_p2);
m_tirq_enabled = false;
m_xirq_enabled = false;
m_timecount_enabled = 0;
@ -1220,14 +1215,25 @@ void mcs48_cpu_device::device_reset()
m_sts = 0;
m_flags_enabled = false;
m_dma_enabled = false;
if (!m_t0_clk_func.isnull())
m_t0_clk_func(0);
// confirmed from interrupt logic description
m_irq_in_progress = false;
m_timer_overflow = false;
m_irq_polled = false;
// BUS is set to high-impedance (except when EA=1)
m_dbbo = 0xff;
m_bus_out_cb(0, 0xff, m_ea ? 0xff : 0); // bus_w
// port 1 and port 2 are set to input mode
m_p1 = 0xff;
m_p2 = 0xff;
port_w(1, m_p1);
port_w(2, m_p2);
if (!m_t0_clk_func.isnull())
m_t0_clk_func(0);
}