// 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); }