Zilog Z16C30 User Manual
Page 176
8-21
Z16C30 USC
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U
SER
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S
M
ANUAL
Z
ILOG
UM97USC0100
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
15
CTSMode
Input/Output Control Register (IOCR)
Register Address 0 b 01011
Bit(s)
Field/Bit
Name
Conditions
/Context
Description
RW
Status
Ref Chapter: Section
IOCR15-14
DCDMode
TxRMode
RxRMode
TxDMode
TxCMode
RxCMode
CTSMode
0x=/CTS pin is low-active Clear To Send input;
10=drive /CTS Low; 11=drive /CTS High
RW
4: The /CTS Pin
IOCR13-12
DCDMode
00=/DCD is low-active Rx Carrier Detect input;
01=/DCD is low-active Rx Sync Detect input;
10=drive /DCD Low; 11=drive /DCD High
4: The /DCD Pin
IOCR11-10
TxRMode
00=/TxREQ pin is an input;
01=drive /TxREQ with Transmit DMA Request;
10=drive /TxREQ Low; 11=drive /TxREQ High
4: The /RxREQ and /TxREQ
Pins
IOCR9-8
RxRMode
00=/RxREQ pin is an input;
01=drive /RxREQ with Receive DMA Request;
10=drive /RxREQ Low; 11=drive /RxREQ High
4: The /RxD and /TxD Pins
IOCR7-6
TxDMode
00=drive /TxD with Transmitter output;
01=release /TxD to high impedance;
10=drive /TxD Low; 11=drive /TxD High
4: The /RxD and /TxD Pins
IOCR5-3
TxCMode
000=/TxC pin is an input;
001=drive /TxC with TxCLK;
010=drive /TxC with Transmit char clock;
011=drive /TxC with Transmit Complete;
100=drive /TxC with output of BRG0;
101=drive /TxC with output of BRG1;
110=drive /TxC with output of CTR1;
111=drive /TxC with Tx output of DPLL
IOCR2-0
RxCMode
000=/RxC pin is an input;
001=drive /RxC with RxCLK;
010=drive /RxC with Receive char clock;
011=drive /RxC with /RxSYNC;
100=drive /RxC with output of BRG0;
101=drive /RxC with output of BRG1;
110=drive /RxC with output of CTR0;
111=drive /RxC with Rx output of DPLL
RW = Read/Write, RO = Read Only, WO = Write Only – for other codes see p. 8-10.
UM009402-0201