HD64570 Datasheet, PDF (176/469 Pages) Hitachi Semiconductor – Serial Communications Adaptor

5.2.19MSCI Synchronous/Address Register 1 (SA1)
Synchronous/address register 1 (SA1) specifies the SYN character pattern for transmission in byte
synchronous mono-sync or byte synchronous external-sync mode, the SYN character pattern for
transmission and reception in byte synchronous bi-sync mode, and the secondary station address in
bit synchronous mode. This register is not used in asynchronous mode.
Async
7
6
5
4
3
2
1
0
— ———————
Byte sync
SA17 SA16 SA15 SA14 SA13 SA12 SA11 SA10
Bit sync HDLC
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial value
1
1
1
1
1
1
1
1
SYN pattern for transmission/address field check
• Byte synchronous mode
Mono-sync
Bi-sync
External-sync
SYN pattern for transmission
SYN pattern for transmission and reception (bits 15–8)
SYN pattern for transmission
• Bit synchronous mode
No address field checked
HDLC ^{Single address 1}
mode _{Single address 2}
Dual address
Not used
Not used
Bits 15–8 of the secondary station address
Bits 15–8 of the secondary station address
Note: This register is not used in asynchronous mode.
Rev. 0, 07/98, page 160 of 453