// license:BSD-3-Clause // copyright-holders:smf /********************************************************************** MOS Technology 6551 Asynchronous Communication Interface Adapter ********************************************************************** _____ _____ GND 1 |* \_/ | 28 R/_W CS0 2 | | 27 phi2 _CS1 3 | | 26 _IRQ _RES 4 | | 25 DB7 RxC 5 | | 24 DB6 XTAL1 6 | | 23 DB5 XTAL2 7 | MOS6551 | 22 DB4 _RTS 8 | | 21 DB3 _CTS 9 | | 20 DB2 TxD 10 | | 19 DB1 _DTR 11 | | 18 DB0 RxD 12 | | 17 _DBR RS0 13 | | 16 _DCD RS1 14 |_____________| 15 Vcc **********************************************************************/ #ifndef MAME_MACHINE_MOS6551_H #define MAME_MACHINE_MOS6551_H #pragma once #include "machine/clock.h" class mos6551_device : public device_t { public: mos6551_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0); auto irq_handler() { return m_irq_handler.bind(); } auto txd_handler() { return m_txd_handler.bind(); } auto rxc_handler() { return m_rxc_handler.bind(); } auto rts_handler() { return m_rts_handler.bind(); } auto dtr_handler() { return m_dtr_handler.bind(); } uint8_t read(offs_t offset); void write(offs_t offset, uint8_t data); void write_xtal1(int state); // txc void write_rxd(int state); void write_rxc(int state); void write_cts(int state); void write_dsr(int state); void write_dcd(int state); void set_xtal(uint32_t clock); void set_xtal(const XTAL &clock) { set_xtal(clock.value()); } protected: virtual void device_start() override; virtual void device_reset() override; virtual void device_add_mconfig(machine_config &config) override; private: enum { SR_PARITY_ERROR = 0x01, SR_FRAMING_ERROR = 0x02, SR_OVERRUN = 0x04, SR_RDRF = 0x08, SR_TDRE = 0x10, SR_DCD = 0x20, SR_DSR = 0x40, SR_IRQ = 0x80 }; enum { PARITY_NONE = 0, PARITY_ODD = 1, PARITY_EVEN = 3, PARITY_MARK = 5, PARITY_SPACE = 7 }; enum { IRQ_DCD = 1, IRQ_DSR = 2, IRQ_RDRF = 4, IRQ_TDRE = 8, IRQ_CTS = 16 }; enum { STATE_START, STATE_DATA, STATE_STOP }; enum { OUTPUT_TXD, OUTPUT_MARK, OUTPUT_BREAK }; void output_irq(int irq); void output_txd(int txd); void output_rxc(int rxc); void output_rts(int rts); void output_dtr(int dtr); void update_irq(); void update_divider(); uint8_t read_rdr(); uint8_t read_status(); uint8_t read_command(); uint8_t read_control(); void write_tdr(uint8_t data); void write_reset(uint8_t data); void write_command(uint8_t data); void write_control(uint8_t data); int stoplength(); void internal_clock(int state); void receiver_clock(int state); void transmitter_clock(int state); static const int internal_divider[16]; static const int transmitter_controls[4][3]; required_device m_internal_clock; devcb_write_line m_irq_handler; devcb_write_line m_txd_handler; devcb_write_line m_rxc_handler; devcb_write_line m_rts_handler; devcb_write_line m_dtr_handler; uint8_t m_control; uint8_t m_command; uint8_t m_status; uint8_t m_tdr; uint8_t m_rdr; uint8_t m_irq_state; int m_irq; int m_txd; int m_rxc; int m_rts; int m_dtr; uint32_t m_xtal; int m_divide; int m_cts; int m_dsr; int m_dcd; int m_rxd; int m_wordlength; int m_extrastop; int m_brk; int m_echo_mode; int m_parity; int m_rx_state; int m_rx_clock; int m_rx_bits; int m_rx_shift; int m_rx_parity; int m_rx_counter; int m_rx_irq_enable; int m_rx_internal_clock; int m_tx_state; int m_tx_output; int m_tx_clock; int m_tx_bits; int m_tx_shift; int m_tx_parity; int m_tx_counter; int m_tx_enable; int m_tx_irq_enable; int m_tx_internal_clock; }; DECLARE_DEVICE_TYPE(MOS6551, mos6551_device) #endif // MAME_MACHINE_MOS6551_H