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CAST C6845 Megafunction Datasheet
Symbol
C6845
CRT
Controller
PDBTRI
RS
RWn
CSn
E
LPSTB
RESETn
CLK
VS
HS
DE
MA[13..0]
RA[4..0]
CURSOR
CRT
Control
Refresh Memory/
Charactor Generator
Addressing
Microprocessor
Interface
Light Pen Strobe
Cursor
Reset & Clock
PU_RESETn
DIN[7..0]
DOUT[7..0]
Pin Description
Name
Type
Polarity
Description
Microprocessor Interface
DIN[7..0]
IN
-
Data Bus Input
DOUT[7..0]
OUT
-
Data Bus Output
PDBTRI
OUT
(See Description)
Processor Data Bus Tri-state
Control
H= Processor Reads
L= Processor Writes
RS
IN
Low
Address Register Select
High
Data Register Select
RWn
IN
Low
Write to Internal Register
High
Read Internal Register
CSn
IN
Low
Chip Select
High
Enable Data Bus Output During
Microprocessor Reads
E
IN
Falling Edge
Register Data During
Microprocessor Writes
Light Pen Strobe Interface
LPSTB
IN
Rising Edge
Light Pen Strobe
Reset and Clock Interface
RESETn
IN
Low
Reset/Test Mode
CLK
IN
Falling Edge
Synchronous Clock (Except for
Micro-processor Interface)
PU_RESETn
IN
Low
Asynchronous Power-up Reset
CRT Control Interface
DE
OUT
High
Display Enable
HS
OUT
High
Horizontal Sync
VS
OUT
High
Vertical Sync
Refresh Memory/Character Generator Addressing Interface
MA[13..0]
OUT
-
Refresh Memory Address
RA[4..0]
OUT
-
Row Address
Cursor Interface
CURSOR
OUT
High
Cursor
Applications
• Point-of-contact Kiosk
CAST, Inc.
Page
2
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