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Z8523316VSG Datasheet(PDF) 2 Page - Zilog, Inc.

Part # Z8523316VSG
Description  EMSCC??Enhanced Mono Serial Communication Controller
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z8523316VSG Datasheet(HTML) 2 Page - Zilog, Inc.

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Z85233 EMSCC™ Enhanced Mono Serial Communication Controller
automatically: transmit a flag before the data, reset
the Tx Underrun/EOM latch, force the TxD pin
high at the appropriate time when using NRZI
encoding, deassert the /RTS pin after the closing
flag, and better handle ABORTed frames when
using the 10x19 status FIFO. The combination of
these features along with the deeper data FIFOs
significantly simplifies SDLC driver software.
The CPU hardware interface has been simplified
by relieving the databus setup time requirement
and supporting the software generation of the inter-
rupt acknowledge signal (/INTACK). These
changes allow an interface with less external logic
to many microprocessor families while maintain-
ing compatibility with existing designs. I/O han-
dling of the EMSCC is improved over the SCC
with faster response of the /INT and /DTR//REQ
pins.
The many enhancements added to the EMSCC per-
mits a system design that increases overall system
performance with better data handling and less
interface logic.
All Signals with a preceding front
slash, "/", are active Low, e.g.: B//W
(WORD is active Low); /B/W (BYTE
is active Low, only).
Power connections follow conventional descrip-
tions below:
Figure 1. Z85233 Functional Block Diagram
Connection
Circuit
Device
Power
VCC
VDD
Ground
GND
VSS
Note:
Internal
Control
Logic
Channel A
Register
Channel B
Register
Interrupt
Control
Logic
CPU & DMA
Bus Interface
Databus
Control
Channel A
Channel B
/INT
/INTACK
IEI
IEO
Interrupt
Control


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