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Diffstat (limited to 'src/devices/cpu/sh2/sh7604_sci.cpp')
-rw-r--r--src/devices/cpu/sh2/sh7604_sci.cpp91
1 files changed, 88 insertions, 3 deletions
diff --git a/src/devices/cpu/sh2/sh7604_sci.cpp b/src/devices/cpu/sh2/sh7604_sci.cpp
index b341c88f509..21b06b7bc7c 100644
--- a/src/devices/cpu/sh2/sh7604_sci.cpp
+++ b/src/devices/cpu/sh2/sh7604_sci.cpp
@@ -1,8 +1,14 @@
// license:BSD-3-Clause
-// copyright-holders:<author_name>
+// copyright-holders:Angelo Salese
/***************************************************************************
-Template for skeleton device
+ SH7604 SCI Controller
+
+ Lies at 0xfffffe00-0xfffffe0f
+
+ TODO:
+ - diserial;
+ - CPU callbacks for RX and TX;
***************************************************************************/
@@ -23,8 +29,83 @@ const device_type SH7604_SCI = &device_creator<sh7604_sci_device>;
// LIVE DEVICE
//**************************************************************************
-static ADDRESS_MAP_START( sci_regs, AS_0, 8, sh7604_sci_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;
+}
+
+static ADDRESS_MAP_START( sci_regs, AS_0, 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
//-------------------------------------------------
@@ -60,6 +141,10 @@ void sh7604_sci_device::device_start()
void sh7604_sci_device::device_reset()
{
+ m_smr = 0;
+ m_scr = 0;
+ m_ssr = STATUS_TDRE|STATUS_TEND; //0x84;
+ m_brr = 0xff;
}