HD64570 Datasheet, PDF (210/469 Pages) Hitachi Semiconductor – Serial Communications Adaptor

Initialization by reset
"RX disable", "RX reset", or "channel reset" issued in any state
RX
disable state
"RX enable" issued
"Message reject" issued
SYNC line input
(external synchronous)
SYN character
mismatch^*2
SYN1 wait ^{*1 SYN character match (mono-sync)}
state
Character
receive state
Second SYN character
First SYN character
match (bi-sync)
mismatch (bi-sync)
SYN2 wait
Second SYN character
match (bi-sync)
state
Notes: 1. SYNC line input wait state for external synchronous mode.
2. SYNC line input not detected for external synchronous mode.
3. Command names are enclosed in double quotation marks ("").
Figure 5.25 State Transition Diagram for Byte Synchronous Mode Reception
Rev. 0, 07/98, page 194 of 453