Zilog Z16C30 - Manual (Page 172)

8-17
Z16C30 USC ®
U SER ' S M ANUAL Z ILOG
UM97USC0100
Bit(s)
Field/Bit
Name
Conditions
/Context
Description
RW
Status
Ref Chapter: Section
CMR11-8
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.
TxMode 1101=13=Reserved
CMR3-0 RxMode
CMR11-8 TxMode 1110=14=HDLC/SDLC Loop RW 5: HDLC/SDLC Loop Mode
CMR15-14 TxSubMode TxMode 00=send 7-bit Abort on Tx Underrun;
01=send 15-bit Abort; 10=send Flag;
11=send CRC then Flag RW
=14
CMR13 (initially) 0=Transmit disabled; 1=insert into loop;
(once inserted) 0=repeat Rx to Tx; 1=send RW
CMR12 1=consecutive idle Flags share a 0
(11111101111111...); 0=(11111100111111...) RW
CMR3-0 RxMode 1110=14=Reserved (use RxMode=0110=6=
HDLC/SDLC, with TxMode=1110=14)
CMR11-8 TxMode 1111=15=Reserved
CMR3-0 RxMode
CMR11-8 TxMode 1001=9=802.3 (Ethernet) RW 5: 802.3 (Ethernet) Mode
CMR15 TxSubMode 1=send CRC on Tx Underrun RW TxMode=9
CMR3-0 RxMode 1001=9=802.3 (Ethernet) RW
CMR4 RxSubMode 0=receive all frames;
1=match 16-bit Destination Address vs RSR RW RxMode=9
CMR11-8 TxMode 101x=10-11=Reserved
CMR3-0 RxMode
CMR11-8 TxMode 1100=12=Slaved Monosync 5: 802.3 (Ethernet) Mode RW
CMR15 TxSubMode 1=send CRC on Tx Underrun RW TxMode
=12
CMR13 0=do not send (stop sending at EOM);
1=send a(nother) message
CMR12 0=send 8-bit Syncs;
1=send Syncs per TxLength
CMR3-0 RxMode 1100=12=Reserved (use RxMode=0100=4=
Monosync, with TxMode=1100=12)
RW = Read/Write, RO = Read Only, WO = Write Only – for other codes see p. 8-10.
UM009402-0201