Zilog Z16C30 User Manual
Page 171

8-16
Z16C30 USC
®
U
SER
'
S
M
ANUAL
Z
ILOG
UM97USC0100
Bit(s)
Field/Bit
Name
Conditions
/Context
Description
RW
Status
Ref Chapter: Section
Channel Mode Register (CMR) (Continued)
Because the content of the SubMode fields depends on the Mode fields, the following descriptions are grouped by mode. TxSubMode
and RxSubMode bits that are not shown for a particular Mode value are Reserved in that mode and should be programmed with zeros.
CMR11-8
TxMode
RW
0101=5=Bisync
CMR15
TxSubMode
RW
1=send CRC on Tx Underrun
TxMode=5
CMR14
0=send closing/idle SYNs from TSR15-8;
1=send closing/idle SYN0/SYN1 (TSR7-0/15-8)
CMR13
1=send Preamble before opening Sync
CMR12
0=send 8-bit Syncs;
1=send Syncs per TxLength
CMR3-0
RxMode
RW
0101=5=Bisync
CMR5
1=strip received Syncs;
0=include them in RxFIFO and CRC calculation
RxSubMode RxMode=5
RW
CMR4
0=expect 8-bit Syncs;
1=expect Syncs per RxLength
CMR11-8
TxMode
0110=6=HDLC/SDLC
RW
5: HDLC/SDLC Mode
CMR7-4
RxSubMode RxMode=6
xx00=no Address or Control field handling;
xx01=1-byte Address only;
x010=1-byte Address, 1-byte Control;
x110=1-byte Address, 2-byte Control;
0011=Extended Address, 1-byte Control;
0111=Extended Address, 2-byte Control;
1011=Extended Address, Control >= 2 bytes;
1111=Extended Address, Control >= 3 bytes
RW
CMR15
TxSubMode
1=send CRC on Tx Underrun
RW
TxMode=7
0=send closing/idle SYNs;
1=send closing/idle DLE-SYNs
CMR14
1=send Preamble before opening DLE-SYN
CMR13
0=send ASCII control characters;
1=send EBCDIC
CMR12
CMR3-0
RxMode
0111=7=Transparent Bisync
RW
CMR4
RxSubMode
0=look for ASCII control characters;
1=look for EBCDIC
RW
RxMode=7
CMR11-8
TxMode
1000=8=Nine Bit
RW
5: Nine Bit Mode
CMR15
TxSubMode
0=send 9th bit 0 (data);
1=send 9th bit 1 (address)
RW
TxMode=8
0=send eight data bits;
1=send seven data bits plus parity
CMR14
00=16 TxCLKs/Tx bit; 01=32 TxCLKs/Tx bit;
10=64 TxCLKs/Tx bit
CMR13-12
CMR3-0
RxMode
1000=8=Nine Bit
RW
CMR5-4
RxSubMode
00=16 RxCLKs/Rx bit; 01=32 RxCLKs/Rx bit;
10=64 RxCLKs/Rx bit
RW
RxMode=8
5: Monosync and Bisync
Modes
CMR11-8
TxMode
0111=7=Transparent Bisync
RW
5: Transparent Bisync Mode
RW = Read/Write, RO = Read Only, WO = Write Only – for other codes see p. 8-10.
UM009402-0201