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SCC/ESCC
User Manual
UM010903-0515
General Description
11
Z85X30 PLCC Pin
Assignment
s
1
2
...
13
14
15
16
17
18
19
20
21
22
23
...
393
394
SCC/ESCC
1
UM010903-0515
2
Revision History
3
Table of Contents
4
SCC’s Capabilities
9
User Manual
13
SCC Block Diagram
13
Pin Descriptions
14
Z85X30 DIP Pin Assignments
17
Z85X30 PLCC Pin Assignments
18
Z80X30 DIP Pin Assignments
19
Interfacing the SCC/ESCC
24
Z80X30 Write Cycle Timing
25
Z80X30 Register Access
28
Z80C30 Register Enhancement
31
Z80230 Register Enhancements
32
Z80X30 Reset
33
Z85X30 Interface Timing
34
Z85X30 Read Cycle Timing
35
Z85X30 Write Cycle Timing
35
D7-D0 Vector
36
Z85X30 Register Access
37
Z85C30 Register Enhancement
39
Z85X30 Reset
41
Interface Programming
42
I/O Programming Introduction
43
Interrupts
43
External/Status Channel A
44
Receive Channel B
44
Transmit Channel B
44
* Always 0 In B Channel
47
Daisy-Chain Resolution
48
Interrupt Acknowledge
51
The Receiver Interrupt
52
Receive Interrupts Disabled
53
Conditio
56
External/Status Interrupts
63
Break/Abort
65
Transmit Underrun/EOM
65
CTS/DCD
66
Zero Count
66
Sync/Hunt
66
Block/DMA Transfer
67
SYNC Modes
68
ASYNC Modes
68
Wait On Receive
69
DMA Requests
70
DMA Request On Receive
74
AD7-AD0 Receive DataWR8
75
Test Functions
76
Introduction
78
Baud Rate Generator
78
Data Encoding/Decoding
81
Clock Selection
90
Clock Multiplexer
92
BRG Clock Source = /RTXC
93
Crystal Oscillator
94
Data Communication Modes
95
Transmit Data Path
96
Asynchronous Mode
99
Asynchronous Transmit
100
Asynchronous Receive
103
Asynchronous Initialization
105
Reg Bit No Description
107
WR4 3 (=0) select sync mode
107
State Changes in One
113
/RTxC Clock Cycle
113
SDLC Transmit
121
SDLC Receive
127
SDLC Frame Status FIFO
133
Frame Status FIFO Circuitr
135
Interface
135
SDLC Loop Mode
137
SDLC Loop Mode Receive
140
SDLC Loop Mode Transmit
140
Register Descriptions
143
Write Registers
145
Definition)
149
Z85X30 Register Map
151
Time Constant
175
Clock Frequency
175
Read Registers
181
Read Register 1
185
Read Register 2
187
Read Register 3
188
Read Register 8
191
Read Register 10
192
Read Register 12
193
Read Register 13
194
Read Register 15
194
Application Notes
195
Abstract
217
Features
217
Discussion
217
Interfaces
218
Z180 to Memory Interface
218
EPROM Interface
220
SRAM Interface
222
SRAM Read Cycle
222
SRAM Write Cycle
223
Memory Interface Logic
223
Physical Memory Address Map
225
Z180 to I/O Interface
226
Z180 I/O Write Cycle Timing
227
Z180 to SCC Interface
230
CPU Hardware Interfacing
230
Data Bus Signals
230
System Control Signals
230
Interrupt Control
231
SCC I/O Operation
231
Read Cycle Timing
231
Write Cycle Timing
232
SCC Interrupt Operation
232
Input/Output Cycles
234
Z180 MPU to SCC Interface
234
SCC I/O Read/Write Cycle
235
I/O Read Cycle
235
I/O Write Cycle
235
Using EPLD
242
System Checkout
243
Software Considerations
244
SCC Read Cycle Proof
244
SCC Write Cycle Proof
244
Interrupt Acknowledge Cycle
244
(Continued)
246
Summary
256
General Description
257
Processor
258
Address Map
260
(PBA)+511
269
Serial Interfacing
270
DMA channel
272
Jumper Summary
276
Control EPLD for 186 Board
278
SCC EPLD for 186 Board
279
DMA EPLD for 186 Board
280
NMI Field for 186 Board
281
Operation
295
ESCC Controller
318
Questions and Answers
382
Customer Support
394
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