HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 196

• Manufacturer Part Number: HD64570
• Description: Serial Communications Adaptor
• Manufacturer: HITACHI [Hitachi Semiconductor]

Rev. 0, 07/98, page 180 of 453
Initialization by reset
"RX reset", "RX disable"
or "channel reset" issued
in any stale
No mark
detected
RX disable
Figure 5.15 State Transition Diagram for Reception in Asynchronous Mode
state
check state
"RX enable" issued
Start bit
Space detected
Note: Command names are enclosed in double quotation marks ("").
Break end
wait state
NG (mark)
OK (space)
Mark detected
(other than 1/1 clock mode)
No space detected
search state
Start bit
NG (space)
No framing error
or break detected
after assembly
Break detected
after assembly
assembly state
Character
After wait
check state
Break end
Framing error
detected,
but no break
detected after
assembly
cycle wait state
Half-bit
OK
(mark)
Mark
detected
(1/1 clock
mode)