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ISCC
User Manual
UM011002-0808
40
3.6 CLOCK SELECTION
The ISCC can select several clock sources for internal and external use. Write Register 11
is the Clock Mode Control register for both the receive and transmit clocks. It determines
the type of signal on the /SYNC and /RTxC pins and the direction of the /TRxC pin.
The ISCC may be programmed to select one of severa
l sources to provide the rece
ive and
receive clocks.
The source of the receive clock is controlled by bits D6 and D5 of WR11. The receive
clock may be programmed to come from th
e /RTxC pin, the /TRxC pin, the output of the
baud rate generator, or the receive output of the DPLL.
The source of the transmit clock is controlled by bits D4 and D3 of WR1
1. The transmit
clock may be programmed to come from the /RTxC pin, the /TRxC pin, the output of the
baud rate generator, or the transmit output of the DPLL.
Ordinarily the /TRxC pin is an input, but it becomes an output if this pin has not been
selected as the source for the
transmitter or the receiver, and bit D2 of WR11 is set to “1.”
The selection of the signal provided on the /TRxC output pin is controlled by bits D1 and
D0 of WR11. The /TRxC pin may be programmed to provide the output of the crystal
oscillator, the output of the baud rate generator, the receive output of the DPLL or the
actual transmit clock. If the output of the crystal oscillator is selected, but the crystal oscil-
lator has not been enabled, the /TRxC pin will be driven HIGH. The option of placing the
transmit clock signal on
the /TRxC pin when it is an output allows access to the transmit
output of the DPLL.
Figure 3-9 shows a simplified schematic diagram of the circuitry used in the clock multi-
plexing. It shows the inputs to the multiplexer section, as well as the
various signal inver-
sions that occu
r in the paths to the outputs.
Page 40 of 316
- User Manual 1
- Revision History 3
- Table of Contents 4
- 1.1 INTRODUCTION 7
- Page 2 of 316 8
- Page 3 of 316 9
- 1.3 Pin Description 12
- Page 7 of 316 13
- Page 8 of 316 14
- Page 9 of 316 15
- Page 10 of 316 16
- 2.1 Introduction 17
- Page 12 of 316 18
- 2.2.3 Data Transfers 19
- 2.3.1 Polling 20
- 2.3.2 Interrupts 21
- 2.3.3 DMA Interrupts 22
- 2.4 REGISTER ACCESS 23
- Page 18 of 316 24
- Page 20 of 316 26
- 2.4.4 DMA Cell Registers 28
- Page 23 of 316 29
- Page 25 of 316 31
- Support Circuitry 32
- Page 27 of 316 33
- 3.3 BAUD RATE GENERATOR 34
- Page 29 of 316 35
- Page 30 of 316 36
- 3.4 DATA ENCODING/DECODING 37
- Page 32 of 316 38
- Page 33 of 316 39
- Page 34 of 316 40
- Page 35 of 316 41
- Page 36 of 316 42
- Page 37 of 316 43
- Page 38 of 316 44
- 3.6 CLOCK SELECTION 46
- Page 41 of 316 47
- Page 43 of 316 49
- 3.7 CRYSTAL OSCILLATORS 50
- Page 45 of 316 51
- Page 46 of 316 52
- Page 47 of 316 53
- Page 48 of 316 54
- 4.2 ASYNCHRONOUS MODE 55
- 4.2.1 Asynchronous Transmit 56
- Page 51 of 316 57
- Page 52 of 316 58
- Page 53 of 316 59
- Page 54 of 316 60
- Page 55 of 316 61
- Page 56 of 316 62
- Page 57 of 316 63
- WR4 0,1 select parity 64
- WR5 1 RTS 64
- 2 select CRC generator 64
- Page 59 of 316 65
- Page 60 of 316 66
- Page 61 of 316 67
- Page 62 of 316 68
- Page 63 of 316 69
- Page 64 of 316 70
- Page 65 of 316 71
- Page 67 of 316 73
- Page 68 of 316 74
- Page 69 of 316 75
- 4.4.1 SDLC Transmit 76
- Page 71 of 316 77
- Page 72 of 316 78
- WR4 1-0 Select parity 79
- WR5 2 Select CRC-CCITT 79
- 4.4.2 SDLC Receive 80
- Page 75 of 316 81
- Page 76 of 316 82
- Page 77 of 316 83
- Page 78 of 316 84
- Page 79 of 316 85
- 4.4.3 SDLC LOOP MODE 86
- Page 81 of 316 87
- Page 82 of 316 88
- Page 83 of 316 89
- Page 84 of 316 90
- Page 85 of 316 91
- 5.1 INTRODUCTION 92
- 5.2 REGISTER DESCRIPTIONS 92
- Page 87 of 316 93
- 5.2.3 DMA Registers 94
- 5.4 WRITE REGISTERS 95
- Page 90 of 316 96
- Page 91 of 316 97
- Page 92 of 316 98
- Page 93 of 316 99
- Mode Definition) 100
- Page 96 of 316 102
- Page 97 of 316 103
- Page 98 of 316 104
- Page 99 of 316 105
- Page 100 of 316 106
- Page 101 of 316 107
- Page 102 of 316 108
- Page 103 of 316 109
- Page 104 of 316 110
- Page 105 of 316 111
- Page 106 of 316 112
- Page 107 of 316 113
- Page 108 of 316 114
- Page 109 of 316 115
- Page 110 of 316 116
- Page 111 of 316 117
- Page 112 of 316 118
- Page 113 of 316 119
- Constant) 120
- Page 116 of 316 122
- Page 117 of 316 123
- Page 118 of 316 124
- Page 119 of 316 125
- 5.5 READ REGISTERS 126
- Page 121 of 316 127
- Page 122 of 316 128
- 5.5.2 Read Register 1 129
- Page 124 of 316 130
- 5.5.3 Read Register 2 131
- 5.5.4 Read Register 3 132
- 5.5.5 Read Register 8 133
- 5.5.6 Read Register 10 133
- 5.5.7 Read Register 12 134
- 5.5.8 Read Register 13 134
- 5.5.9 Read Register 15 135
- Page 130 of 316 136
- 5.6.2 DMA Status Register 137
- Page 132 of 316 138
- Page 133 of 316 139
- Page 135 of 316 141
- Page 136 of 316 142
- 5.6.7 DMA Enable Register 143
- 5.6.8 DMA Control Register 144
- Page 139 of 316 145
- Page 140 of 316 146
- Page 141 of 316 147
- Page 143 of 316 149
- UM011002-0808 149
- Page 145 of 316 151
- Page 146 of 316 152
- Page 147 of 316 153
- Customer Support 154
- PPLICATION 155
- Write Cycle Timing 157
- INPUT/OUTPUT CYCLES 159
- Z80A CPU to Z8500 Peripherals 159
- INPUT/OUTPUT CYCLES 160
- (Continued) 160
- Z90H CPU TO Z8500 PERIPHERALS 164
- INTERRUPT ACKNOWLEDGE CYCLES 169
- EXTERNAL INTERFACE LOGIC 169
- CPU/Peripheral Same Speed 169
- Z8500/Z8500A Peripherals 171
- Software 176
- Interfacing Z80 177
- INTRODUCTION 178
- INTERFACES 179
- Z180 to Memory Interface 179
- EPROM INTERFACE 181
- '74 '74 184
- Z180 TO I/O INTERFACE 185
- (Continued) 189
- SCC Interrupt Operation 189
- Z180 MPU to SCC Interface 191
- SCC I/O Read/Write Cycle 191
- USING EPLD 196
- Application Note 198
- Page 192 of 316 198
- CONCLUSION 210
- GENERAL DESCRIPTION 211
- GENERAL DESCRIPTION 212
- Processor 212
- Address Map 213
- UM011001-0601 216
- IUSC (Continued) 220
- SERIAL INTERFACING 220
- JUMPER SUMMARY 225
- DMA/EPLD LOGIC 226
- DMA/EPLD LOGIC (Continued) 228
- YNCHRONOUS 231
- OMMUNICATIONS 231
- SYNCHRONOUS MODES 232
- SYSTEM INTERFACE 232
- CONTROL BUS 233
- EPROM CONTROL BUS 233
- RAM CONTROL BUS 233
- ADDRESS/DATA BUS 233
- SYSTEM INTERFACE 234
- INITIALIZATION 235
- INITIALIZATION 236
- APPENDIX 238
- SOFTWARE ROUTINES 238
- RECEIVE ROUTINE 240
- TRANSMIT ROUTINE 241
- RECEIVE INT. SERVICE ROUTINE 242
- SDLC TRANSMIT 245
- SDLC RECEIVE 247
- /W//REQ (In /REQ mode) 249
- ONLY MODE 251
- Master SCC 253
- Slave SCC #1 253
- Slave SCC #2 253
- Slave SCC #n 253
- DATA TRANSFER MODES 256
- SDLC PROTOCOL 257
- TRANSMIT OPERATION 262
- RECEIVE OPERATION 262
- SOFTWARE 265
- RECEIVE OPERATION 267
- ESCC/SCC DIFFERENCES 269
- ESCC SYSTEM BENEFITS 271
- TRANSMIT FIFO INTERRUPT 272
- RECEIVE FIFO INTERRUPT 273
- AUTOMATIC /RTS DEASSERTION 274
- MODIFIED WRITE TIMING 280
- HARDWARE CONFIGURATION 284
- TRANSMITTING A LLAP FRAME 286
- RECEIVING LLAP FRAMES 286
- CONCLUSIONS 287
- APPENDIX A 288
- APPENDIX B 298
- SCILLATOR 301
- Quartz Equivalent Circuit 303
- Symbolic Representation 303
- Load Capacitors 305
- Amplifier Characteristics 305
- Signal Line 308
- Layout Should 308
- Avoid High 308
- Lighted Areas 308
- NTERFACING 311
- CONFIGURING THE BUS 315
- APPLICATIONS EXAMPLES 318
- ONTROLLER 321
- ISCC QUESTIONS AND ANSWERS 322
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