Zilog Z16C30 Manual do Utilizador descarregar pdf (Página 181)

8-26

Z16C30 USC

USER'S MANUAL

ZILOG

UM97USC0100

14 13 12 11 10 9 8 7 6 5 4 3 2 1 015

Rcmd (WO)

Receive Command/Status Register (RCSR) Register Address 1 0 b 10010

Bit(s)

Field/Bit

Name

Conditions

/Context

Description

Status

Ref Chapter: Section

ShortF/

CVType

RCSR15-12

2ndBE 1stBE

RxResidue

Exited

Hunt

Idle

Rcved

Break

/Abort

Bound

CRCE

/FE

Abort

/PE

Over

Avail

RCmd Sync 0000=no operation; 0001=Reserved;

0010=Clear Receive CRC Generator;

0011=Enter Hunt Mode; 0100=Reserved;

0101=Select RICRHi=RxFIFO Status;

0110=Select RICRHi=/INT Level;

0111=Select RICRHi=/RxREQ Level;

1xxx=Reserved

WO 5: Commands

RCSR15 2ndBE Last RDR

read was

16 bits

1=2nd-oldest byte in RxFIFO had RxBound,

PE, or RxOver when RDR was last read

RO 5: Status Reporting:

Detailed Status in the RCSR

RCSR14 1stBE 1=oldest byte in RxFIFO had RxBound,

PE, or RxOver when RDR was last read

RCSR11-19 RxResidue 000=frame ended at character boundary;

001-111=number of extra bits at end

RO 5: HDLC/SDLC Mode:

Frame Length Residuals

H/SDLC

RCSR8 ShortF/

CVType

H/SDLC,

CMR7-4

not xx00

1=received frame ended before

Address/Control fields (see Note 1)

R,W1U

or RO

5: Status Reporting:

Detailed Status in the RCSR

0=received Data word;

1=received Command/Status word (see Note 1)

ACV

(1553B)

RCSR7 ExitedHunt 1=receiver has left Hunt mode R,W1U

RCSR6 IdleRcved 1=15 or 16 ones received R,W1U

RCSR5 Break/Abort 1=Break received R,W1U

H/SDLC

Async

1=Abort received

RCSR4 RxBound 1=address character (see Note 2) R,W1C

or RO

ACV

(1553B)

Nine Bit

1=2nd (or only) byte of word (see Note 2)

Ext Sync,

T. Bisync

1=end of message (see Note 2)

1=end of frame (see Note 2)HDLC/

SDLC

802.3

RCSR3 CRCE/FE 1=CRC not correct (at this point; see Note 1) RO

Async

Sync

1=framing error (Stop bit = zero/space;

see Note 1)

RCSR2 Abort/PE 1=parity error (see Note 2) R,W1C

or RO

RCSR1 RxOver 1=RxFIFO overflow (see Note 2) R,W1C

RO??

RCSR0 RxAvail 1=RxFIFO is not empty RO

Note 1: The USC carries these bits through the RxFIFO with data characters; they may represent the status of the oldest character or two

currently in the FIFO, or of the last one or two read from it, as described in the referenced Chapter/Section.

Note 2: The USC carries these bits through the RxFIFO with data characters; they may represent the status of the oldest character or two

currently in the FIFO, of the last one or two read from it, or may be a cumulative/latched bit, as described in the referenced Chapter/Section.

QAbort

(RMR8)=0

H/SDLC,

QAbort=1

1=Abort followed this character (see Note 2)

RW = Read/Write, RO = Read Only, WO = Write Only – for other codes see p. 8-10.

UM009402-0201

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