C6845 Datasheet, PDF (2/6 Pages) List of Unclassifed Manufacturers – CRT Controller Megafunction

CAST C6845 Megafunction Datasheet
Symbol
Microprocessor
Interface
PDBTRI
DOUT[7..0]
DIN[7..0]
RS
RWn
CSn
E
Light Pen Strobe
LPSTB
Reset & Clock
RESETn
CLK
PU_RESETn
C6845
CRT
Controller
VS
HS
DE
MA[13..0]
RA[4..0]
CURSOR
CRT
Control
Refresh Memory/
Charactor Generator
Addressing
Cursor
Pin Description
Name
DIN[7..0]
DOUT[7..0]
PDBTRI
RS
RWn
CSn
E
LPSTB
RESETn
CLK
PU_RESETn
DE
HS
VS
MA[13..0]
RA[4..0]
CURSOR
Applications
Type
Polarity
Description
Microprocessor Interface
IN
-
Data Bus Input
OUT
-
Data Bus Output
Processor Data Bus Tri-state
OUT
(See Description)
Control
H= Processor Reads
L= Processor Writes
IN
Low
Address Register Select
High
Data Register Select
IN
Low
Write to Internal Register
High
Read Internal Register
IN
Low
Chip Select
IN
High
Enable Data Bus Output During
Microprocessor Reads
Falling Edge
Register Data During
Microprocessor Writes
Light Pen Strobe Interface
IN
Rising Edge
Light Pen Strobe
Reset and Clock Interface
IN
Low
Reset/Test Mode
IN
Falling Edge
Synchronous Clock (Except for
Micro-processor Interface)
IN
Low
Asynchronous Power-up Reset
CRT Control Interface
OUT
High
Display Enable
OUT
High
Horizontal Sync
OUT
High
Vertical Sync
Refresh Memory/Character Generator Addressing Interface
OUT
-
Refresh Memory Address
OUT
-
Row Address
Cursor Interface
OUT
High
Cursor
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CAST, Inc.
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