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-rw-r--r--trunk/src/emu/machine/6840ptm.h139
1 files changed, 139 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/6840ptm.h b/trunk/src/emu/machine/6840ptm.h
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index 00000000000..ea10790e98e
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+++ b/trunk/src/emu/machine/6840ptm.h
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+/***************************************************************************
+
+ Motorola 6840 (PTM)
+
+ Programmable Timer Module
+
+***************************************************************************/
+
+#pragma once
+
+#ifndef __6840PTM_H__
+#define __6840PTM_H__
+
+#include "emu.h"
+
+
+
+//**************************************************************************
+// DEVICE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_PTM6840_ADD(_tag, _interface) \
+ MCFG_DEVICE_ADD(_tag, PTM6840, 0) \
+ ptm6840_device::static_set_interface(*device, _interface);
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> ptm6840_interface
+
+struct ptm6840_interface
+{
+ double m_internal_clock;
+ double m_external_clock[3];
+
+ devcb_write8 m_out_cb[3]; // function to call when output[idx] changes
+ devcb_write_line m_irq_cb; // function called if IRQ line changes
+};
+
+
+
+// ======================> ptm6840_device
+
+class ptm6840_device : public device_t,
+ public ptm6840_interface
+{
+public:
+ // construction/destruction
+ ptm6840_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ // static configuration helpers
+ static void static_set_interface(device_t &device, const ptm6840_interface &interface);
+
+ int status(int clock) const { return m_enabled[clock]; } // get whether timer is enabled
+ int irq_state() const { return m_IRQ; } // get IRQ state
+ UINT16 count(int counter) const { return compute_counter(counter); } // get counter value
+ void set_ext_clock(int counter, double clock); // set clock frequency
+ int ext_clock(int counter) const { return m_external_clock[counter]; } // get clock frequency
+
+ DECLARE_WRITE8_MEMBER( write );
+ void write(offs_t offset, UINT8 data) { write(*machine().memory().first_space(), offset, data); }
+ DECLARE_READ8_MEMBER( read );
+ UINT8 read(offs_t offset) { return read(*machine().memory().first_space(), offset); }
+
+ void set_gate(int idx, int state);
+ DECLARE_WRITE_LINE_MEMBER( set_g1 );
+ DECLARE_WRITE_LINE_MEMBER( set_g2 );
+ DECLARE_WRITE_LINE_MEMBER( set_g3 );
+
+ void set_clock(int idx, int state);
+ DECLARE_WRITE_LINE_MEMBER( set_c1 );
+ DECLARE_WRITE_LINE_MEMBER( set_c2 );
+ DECLARE_WRITE_LINE_MEMBER( set_c3 );
+
+ void update_interrupts();
+
+protected:
+ // device-level overrides
+ virtual void device_start();
+ virtual void device_reset();
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
+
+private:
+ void subtract_from_counter(int counter, int count);
+ void tick(int counter, int count);
+ void timeout(int idx);
+
+ UINT16 compute_counter(int counter) const;
+ void reload_count(int idx);
+
+ enum
+ {
+ PTM_6840_CTRL1 = 0,
+ PTM_6840_CTRL2 = 1,
+ PTM_6840_STATUS = 1,
+ PTM_6840_MSBBUF1 = 2,
+ PTM_6840_LSB1 = 3,
+ PTM_6840_MSBBUF2 = 4,
+ PTM_6840_LSB2 = 5,
+ PTM_6840_MSBBUF3 = 6,
+ PTM_6840_LSB3 = 7,
+ };
+
+ devcb_resolved_write8 m_out_func[3]; // function to call when output[idx] changes
+ devcb_resolved_write_line m_irq_func; // function called if IRQ line changes
+
+ UINT8 m_control_reg[3];
+ UINT8 m_output[3]; // Output states
+ UINT8 m_gate[3]; // Input gate states
+ UINT8 m_clk[3]; // Clock states
+ UINT8 m_enabled[3];
+ UINT8 m_mode[3];
+ UINT8 m_fired[3];
+ UINT8 m_t3_divisor;
+ UINT8 m_t3_scaler;
+ UINT8 m_IRQ;
+ UINT8 m_status_reg;
+ UINT8 m_status_read_since_int;
+ UINT8 m_lsb_buffer;
+ UINT8 m_msb_buffer;
+
+ // Each PTM has 3 timers
+ emu_timer *m_timer[3];
+
+ UINT16 m_latch[3];
+ UINT16 m_counter[3];
+
+ static const char *const opmode[];
+};
+
+
+// device type definition
+extern const device_type PTM6840;
+
+
+#endif /* __6840PTM_H__ */