1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
|
/**********************************************************************
Motorola MC68901 Multi Function Peripheral emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************
_____ _____
R/_W 1 |* \_/ | 48 _CS
RS1 2 | | 47 _DS
RS2 3 | | 46 _DTACK
RS3 4 | | 45 _IACK
RS4 5 | | 44 D7
RS5 6 | | 43 D6
TC 7 | | 42 D5
SO 8 | | 41 D4
SI 9 | | 40 D3
RC 10 | | 39 D2
Vcc 11 | | 38 D1
NC 12 | MC68901 | 37 D0
TAO 13 | MK68901 | 36 GND
TBO 14 | | 35 CLK
TCO 15 | | 34 _IEI
TDO 16 | | 33 _IEO
XTAL1 17 | | 32 _IRQ
XTAL2 18 | | 31 _RR
TAI 19 | | 30 _TR
TBI 20 | | 29 I7
_RESET 21 | | 28 I6
I0 22 | | 27 I5
I1 23 | | 26 I4
I2 24 |_____________| 25 I3
**********************************************************************/
#pragma once
#ifndef __MC68901__
#define __MC68901__
#include "emu.h"
//**************************************************************************
// MACROS / CONSTANTS
//**************************************************************************
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_MC68901_ADD(_tag, _clock, _config) \
MCFG_DEVICE_ADD((_tag), MC68901, _clock) \
MCFG_DEVICE_CONFIG(_config)
#define MC68901_INTERFACE(name) \
const mc68901_interface (name) =
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> mc68901_interface
struct mc68901_interface
{
int m_timer_clock; /* timer clock */
int m_rx_clock; /* serial receive clock */
int m_tx_clock; /* serial transmit clock */
devcb_write_line m_out_irq_cb;
devcb_read8 m_in_gpio_cb;
devcb_write8 m_out_gpio_cb;
devcb_write_line m_out_tao_cb;
devcb_write_line m_out_tbo_cb;
devcb_write_line m_out_tco_cb;
devcb_write_line m_out_tdo_cb;
devcb_read_line m_in_si_cb;
devcb_write_line m_out_so_cb;
devcb_write_line m_out_rr_cb;
devcb_write_line m_out_tr_cb;
};
// ======================> mc68901_device
class mc68901_device : public device_t,
public device_serial_interface,
public mc68901_interface
{
public:
// construction/destruction
mc68901_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
DECLARE_READ8_MEMBER( read );
DECLARE_WRITE8_MEMBER( write );
int get_vector();
DECLARE_WRITE_LINE_MEMBER( i0_w );
DECLARE_WRITE_LINE_MEMBER( i1_w );
DECLARE_WRITE_LINE_MEMBER( i2_w );
DECLARE_WRITE_LINE_MEMBER( i3_w );
DECLARE_WRITE_LINE_MEMBER( i4_w );
DECLARE_WRITE_LINE_MEMBER( i5_w );
DECLARE_WRITE_LINE_MEMBER( i6_w );
DECLARE_WRITE_LINE_MEMBER( i7_w );
DECLARE_WRITE_LINE_MEMBER( tai_w );
DECLARE_WRITE_LINE_MEMBER( tbi_w );
DECLARE_WRITE_LINE_MEMBER( rc_w );
DECLARE_WRITE_LINE_MEMBER( tc_w );
protected:
// device-level overrides
virtual void device_config_complete();
virtual void device_start();
virtual void device_reset();
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
// device_serial_interface overrides
virtual void tra_callback();
virtual void tra_complete();
virtual void rcv_callback();
virtual void rcv_complete();
virtual void input_callback(UINT8 state);
void check_interrupts();
void take_interrupt(UINT16 mask);
void rx_buffer_full();
void rx_error();
void tx_buffer_empty();
void tx_error();
int get_parity_bit(UINT8 b);
void serial_receive();
void tx_disabled();
void tx_starting();
void tx_break();
void tx_enabled();
void serial_transmit();
void timer_count(int index);
void timer_input(int index, int value);
void gpio_input(int bit, int state);
void register_w(offs_t offset, UINT8 data);
private:
enum
{
TIMER_A = 0,
TIMER_B,
TIMER_C,
TIMER_D
};
enum
{
REGISTER_GPIP = 0,
REGISTER_AER,
REGISTER_DDR,
REGISTER_IERA,
REGISTER_IERB,
REGISTER_IPRA,
REGISTER_IPRB,
REGISTER_ISRA,
REGISTER_ISRB,
REGISTER_IMRA,
REGISTER_IMRB,
REGISTER_VR,
REGISTER_TACR,
REGISTER_TBCR,
REGISTER_TCDCR,
REGISTER_TADR,
REGISTER_TBDR,
REGISTER_TCDR,
REGISTER_TDDR,
REGISTER_SCR,
REGISTER_UCR,
REGISTER_RSR,
REGISTER_TSR,
REGISTER_UDR
};
enum
{
INT_GPI0 = 0,
INT_GPI1,
INT_GPI2,
INT_GPI3,
INT_TIMER_D,
INT_TIMER_C,
INT_GPI4,
INT_GPI5,
INT_TIMER_B,
INT_XMIT_ERROR,
INT_XMIT_BUFFER_EMPTY,
INT_RCV_ERROR,
INT_RCV_BUFFER_FULL,
INT_TIMER_A,
INT_GPI6,
INT_GPI7
};
enum
{
GPIP_0 = 0,
GPIP_1,
GPIP_2,
GPIP_3,
GPIP_4,
GPIP_5,
GPIP_6,
GPIP_7
};
enum
{
SERIAL_START = 0,
SERIAL_DATA,
SERIAL_PARITY,
SERIAL_STOP
};
enum
{
XMIT_OFF = 0,
XMIT_STARTING,
XMIT_ON,
XMIT_BREAK,
XMIT_STOPPING
};
static const int INT_MASK_GPIO[];
static const int INT_MASK_TIMER[];
static const int GPIO_TIMER[];
static const int PRESCALER[];
devcb_resolved_read8 m_in_gpio_func;
devcb_resolved_write8 m_out_gpio_func;
devcb_resolved_read_line m_in_si_func;
devcb_resolved_write_line m_out_so_func;
devcb_resolved_write_line m_out_tao_func;
devcb_resolved_write_line m_out_tbo_func;
devcb_resolved_write_line m_out_tco_func;
devcb_resolved_write_line m_out_tdo_func;
devcb_resolved_write_line m_out_irq_func;
//int m_device_type; /* device type */
/* registers */
UINT8 m_gpip; /* general purpose I/O register */
UINT8 m_aer; /* active edge register */
UINT8 m_ddr; /* data direction register */
UINT16 m_ier; /* interrupt enable register */
UINT16 m_ipr; /* interrupt pending register */
UINT16 m_isr; /* interrupt in-service register */
UINT16 m_imr; /* interrupt mask register */
UINT8 m_vr; /* vector register */
UINT8 m_tacr; /* timer A control register */
UINT8 m_tbcr; /* timer B control register */
UINT8 m_tcdcr; /* timers C and D control register */
UINT8 m_tdr[4]; /* timer data registers */
UINT8 m_scr; /* synchronous character register */
UINT8 m_ucr; /* USART control register */
UINT8 m_tsr; /* transmitter status register */
UINT8 m_rsr; /* receiver status register */
UINT8 m_udr; /* USART data register */
/* counter timer state */
UINT8 m_tmc[4]; /* timer main counters */
int m_ti[4]; /* timer in latch */
int m_to[4]; /* timer out latch */
/* interrupt state */
//int m_irqlevel; /* interrupt level latch */
/* serial state */
UINT8 m_next_rsr; /* receiver status register latch */
int m_rsr_read; /* receiver status register read flag */
int m_rxtx_word; /* word length */
int m_rxtx_start; /* start bits */
int m_rxtx_stop; /* stop bits */
/* receive state */
UINT8 m_rx_buffer; /* receive buffer */
int m_rx_bits; /* receive bit count */
int m_rx_parity; /* receive parity bit */
int m_rx_state; /* receive state */
/* transmit state */
UINT8 m_tx_buffer; /* transmit buffer */
int m_tx_bits; /* transmit bit count */
int m_tx_parity; /* transmit parity bit */
int m_tx_state; /* transmit state */
int m_xmit_state; /* transmitter state */
// timers
emu_timer *m_timer[4]; /* counter timers */
};
// device type definition
extern const device_type MC68901;
#endif
|