diff options
Diffstat (limited to 'src/devices/cpu/sh/sh7604_sci.cpp')
| -rw-r--r-- | src/devices/cpu/sh/sh7604_sci.cpp | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/src/devices/cpu/sh/sh7604_sci.cpp b/src/devices/cpu/sh/sh7604_sci.cpp new file mode 100644 index 00000000000..248e0112622 --- /dev/null +++ b/src/devices/cpu/sh/sh7604_sci.cpp @@ -0,0 +1,156 @@ +// license:BSD-3-Clause +// copyright-holders:Angelo Salese +/*************************************************************************** + + SH7604 SCI Controller + + Lies at 0xfffffe00-0xfffffe0f + + TODO: + - diserial; + - CPU callbacks for RX and TX; + +***************************************************************************/ + +#include "emu.h" +#include "sh7604_sci.h" + + + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +// device type definition +DEFINE_DEVICE_TYPE(SH7604_SCI, sh7604_sci_device, "sh7604sci", "SH7604 SCI Controller") + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +READ8_MEMBER(sh7604_sci_device::serial_mode_r) +{ + return m_smr; +} + +WRITE8_MEMBER(sh7604_sci_device::serial_mode_w) +{ + m_smr = data; + + logerror("%s: serial mode set:\n",tag()); + logerror("\tCommunication Mode: %s mode\n",data & 0x80 ? "clocked synchronous" : "asynchronous"); + logerror("\tCharacter Length: %s mode\n",data & 0x40 ? "7-bit" : "8-bit"); + logerror("\tParity Enable: %s\n",data & 0x20 ? "yes" : "no"); + logerror("\tParity Mode: %s\n",data & 0x10 ? "Odd" : "Even"); + logerror("\tStop bits: %s\n",data & 0x08 ? "2" : "1"); + logerror("\tMultiprocessor mode: %s\n",data & 0x04 ? "yes" : "no"); + logerror("\tClock select: clock/%d\n",4 << ((data & 0x03)*2)); +} + +READ8_MEMBER(sh7604_sci_device::serial_control_r) +{ + return m_scr; +} + +WRITE8_MEMBER(sh7604_sci_device::serial_control_w) +{ + m_scr = data; + + if(data & 0x30) + throw emu_fatalerror("%s: enabled serial control %02x\n", tag(),data); +} + +READ8_MEMBER(sh7604_sci_device::serial_status_r) +{ + return m_ssr; +} + +WRITE8_MEMBER(sh7604_sci_device::serial_ack_w) +{ + // TODO: verify this + m_ssr = (m_ssr & 0x06) | (m_ssr & data & 0xf9); +} + +READ8_MEMBER(sh7604_sci_device::bitrate_r ) +{ + return m_brr; +} + +WRITE8_MEMBER(sh7604_sci_device::bitrate_w ) +{ + m_brr = data; +} + +READ8_MEMBER(sh7604_sci_device::transmit_data_r) +{ + // ... + return 0; +} + +WRITE8_MEMBER(sh7604_sci_device::transmit_data_w) +{ + // ... +} + +READ8_MEMBER(sh7604_sci_device::receive_data_r) +{ + // ... + return 0; +} + +DEVICE_ADDRESS_MAP_START( sci_regs, 8, sh7604_sci_device ) + AM_RANGE(0x00, 0x00) AM_READWRITE(serial_mode_r, serial_mode_w) + AM_RANGE(0x01, 0x01) AM_READWRITE(bitrate_r, bitrate_w) + AM_RANGE(0x02, 0x02) AM_READWRITE(serial_control_r,serial_control_w) + AM_RANGE(0x03, 0x03) AM_READWRITE(transmit_data_r, transmit_data_w) + AM_RANGE(0x04, 0x04) AM_READWRITE(serial_status_r, serial_ack_w) + AM_RANGE(0x05, 0x05) AM_READ(receive_data_r) +ADDRESS_MAP_END + +//------------------------------------------------- +// sh7604_sci_device - constructor +//------------------------------------------------- + +sh7604_sci_device::sh7604_sci_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : device_t(mconfig, SH7604_SCI, tag, owner, clock) + +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void sh7604_sci_device::device_start() +{ +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void sh7604_sci_device::device_reset() +{ + m_smr = 0; + m_scr = 0; + m_ssr = STATUS_TDRE|STATUS_TEND; //0x84; + m_brr = 0xff; +} + + +//************************************************************************** +// READ/WRITE HANDLERS +//************************************************************************** + +READ8_MEMBER( sh7604_sci_device::read ) +{ + return space.read_byte(offset); +} + +WRITE8_MEMBER( sh7604_sci_device::write ) +{ + space.write_byte(offset,data); +} |