M69000 Asiliant Technologies, M69000 Datasheet - Page 142

• Manufacturer Part Number: M69000
• Manufacturer: Asiliant Technologies

Specifications of M69000

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Sequencer Registers
10-7
SR07
Horizontal Character Counter Reset Register
read/write at I/O address 3C5h with index at address 3C4h set to index 07h
7
6
5
4
3
2
1
0
Horizontal Character Counter Reset
Writing this register with any data will cause the horizontal character counter to be held in reset (the
character counter output will remain 0) until a write occurs to any other sequencer register location with SRX
set to an index of 0 through 6.
The vertical line counter is clocked by a signal derived from the horizontal display enable (which does not
occur if the horizontal counter is held in reset). Therefore, if a write occurs to this register occurs during the
vertical retrace interval, both the horizontal and vertical counters will be set to 0. A write to any other
sequencer register location (with SRX set to an index of 0 through 6) may then be used to start both counters
with reasonable synchronization to an external event via software control.
This is a standard VGA register which was not documented by IBM.
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69000 Databook
Subject to Change Without Notice
Revision 1.3 8/31/98