Zilog Z16C30 - Manual (Page 174)

8-19
Z16C30 USC ®
U SER ' S M ANUAL Z ILOG
UM97USC0100
14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 15
IOP
IUS
Daisy Chain Control Register (DCCR) Register Address 0 b 01101
Bit(s)
Field/Bit
Name
Conditions
/Context
Description
RW
Status
Ref Chapter: Section
Misc
IP
DCCR15-14
IOP
IP
TD
IP
TS
IP
RD
IP
RS
IP
IP Op
(WO)
TD
IUS
TS
IUS
RD
IUS
RS
IUS
IUS Op
(WO)
IUS Op Write 0x=no operation;
10=clear IUS bits selected by 1s in DCCR13-8;
11=set IUS bits selected by 1s in DCCR13-8 WO 7: Interrupt Pending and
Under Service Bits
DCCR13 RS IUS Read 1=Receive Status interrupt under service RO
7: Interrupt Pending and
Under Service Bits
7: Rx Status Interrupt Sour-
ces and IA Bits
Write 1=set or clear Receive Status IUS per IUS Op;
0=no change WO
DCCR12 RD IUS Read 1=Receive Data interrupt under service RO 7: Interrupt Pending and
Under Service Bits
7: Rx Data Interrupts
Write 1=set or clear Receive Data IUS per IUS Op;
0=no change WO
DCCR11 TS IUS Read 1=Transmit Status interrupt under service RO 7: Interrupt Pending and
Under Service Bits
7: Tx Status Interrupt Sour-
ces and IA Bits
Write 1=set or clear Transmit Status IUS per IUS Op;
0=no change WO
DCCR10 TD IUS Read 1=Transmit Data interrupt under service RO 7: Interrupt Pending and
Under Service Bits
7: Transmit Data Interrupts
Write 1=set or clear Transmit Data IUS per IUS Op;
0=no change WO
DCCR9 IOP IUS Read 1=I/O Pin interrupt under service RO 7: Interrupt Pending and
Under Service Bits
7: I/O Pin Interrupt Sources
and IA Bits
Write 1=set or clear I/O Pin IUS per IUS Op;
0=no change WO
DCCR8 Misc IUS Read 1=Miscellaneous interrupt under service RO 7: Interrupt Pending and
Under Service Bits
7: Miscellaneous Interrupt
Sources and IA Bits
Write 1=set or clear Miscellaneous per IUS Op;
0=no change WO
DCCR7-6 IP Op Write 00=no operation;
01=clear IP and IUS bits sel by 1s in DCCR5-0;
10=clear IP bits selected by 1s in DCCR5-0;
11=set IP bits selected by 1s in DCCR5-0 WO 7: Interrupt Pending and
Under Service Bits
DCCR5 RS IP Read 1=Receive Status interrupt pending RO 7: Interrupt Pending and
Under Service Bits
7: Rx Status Interrupt
Sources and IA Bits
Write WO 1=set or clear Receive Status IP/IUS per IP Op;
0=no change
DCCR4 RD IP Read 1=Receive Data interrupt pending RO 7: Interrupt Pending and
Under Service Bits
7: Rx Data Interrupts
Write WO 1=set or clear Receive Data IP/IUS per IP Op;
0=no change
DCCR3 TS IP Read 1=Transmit Status interrupt pending RO
7: Interrupt Pending and
Under Service Bits
7: Tx Status Interrupt
Sources & IA Bits
Write WO 1=set or clear Transmit Status IP/IUS per IP Op;
0=no change
DCCR2 TD IP Read 1=Transmit Data interrupt pending RO 7: Interrupt Pending and
Under Service Bits
7: Transmit Data
Interrupts
Write WO 1=set or clear Transmit Data IP/IUS per IP Op;
0=no change
DCCR1 IOP IP Read 1=I/O Pin interrupt pending RO
7: Interrupt Pending and
Under Service Bits
7: I/O Pin Interrupt
Sources & IA Bits
Write WO 1=set or clear I/O Pin IP/IUS per IP Op;
0=no change
DCCR0 Misc IP Read 1=Miscellaneous interrupt pending RO
7: Interrupt Pending and
Under Service Bits
7: Miscellaneous Interrupt
Sources and IA Bits
Write WO 1=set or clear Miscellaneous IP/IUS per IP Op;
0=no change
Misc
IUS
RW = Read/Write, RO = Read Only, WO = Write Only – for other codes see p. 8-10.
UM009402-0201