21
CHAPTER 4: Operation
REGISTER
NUMBER
REGISTER FUNCTION
S27
Bit mapped register stored in nonvolatile RAM
Bit 0
Transmission mode
Bit 1
Transmission mode
Bit 1
Bit 0
Function
0
0
Asynchronous mode —
default
0
1
Synchronous mode 1
1
0
Synchronous mode 2
1
1
Synchronous mode 3
Bit 2
Reserved
Bit 3
Reserved
Bit 4
Transmission mode
Bit 5
Transmission mode
Bit 5
Bit 4
Function
0
0
Internal mode clock used —
default
0
1
DTE supplied clock
1
0
Slave clock mode
1
1
Same as “00”
Bit 6
CCITT or Bell handshaking standard
0
CCITT handshake
1
Bell handshake (including CCITT V.22 bis)
Bit 7
Reserved