Zilog Z16C30 - 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