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Z85230 Datasheet(PDF) 3 Page - Zilog, Inc.

Part # Z85230
Description  ENHANCED SERIAL COMMUNICATIONS CONTROLLER
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z85230 Datasheet(HTML) 3 Page - Zilog, Inc.

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Table of Contents
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pins Common to Both the Z85230 and Z80230 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin Descriptions Exclusive to the Z85230 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin Descriptions Exclusive to the Z80230 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Input/Output Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ESCC Data Communications Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Z80230/Z85230 Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4-Byte Transmit FIFO Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8-Byte Receive FIFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Write Register 7 PRIME (WR7’) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
CRC Reception in SDLC Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
TxD Forced High in SDLC with NRZI Encoding When Marking Idle . . . . . . . . . . 27
Improved Transmit Interrupt Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
DPLL Counter Tx Clock Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Read Register 0 Status Latched During Read Cycle . . . . . . . . . . . . . . . . . . . . . . . . 28
Software Interrupt Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Fast SDLC Transmit Data Interrupt Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
SDLC FIFO Frame Status Enhancement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
FIFO Enable/Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
FIFO Read Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
FIFO Write Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
SDLC Status FIFO Anti-Lock Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Initializing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Write Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Read Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Z80230 Interface Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Z80230 Write Cycle Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Z80230 Read Cycle Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Z80230 Interrupt Acknowledge Cycle Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Z85230 Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Z85230 Read Cycle Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Z85230 Write Cycle Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Z85230 Interrupt Acknowledge Cycle Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76


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