參數(shù)資料
型號： SCN68652AC2A44
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Multi-protocol communications controller MPCC
中文描述： 1 CHANNEL(S), 2M bps, MULTI PROTOCOL CONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 14/28頁
文件大小： 651K
代理商： SCN68652AC2A44
Philips Semiconductors
Product specification
SCN2652/SCN68652
Multi-protocol communications controller (MPCC)
1995 May 01
14
Table 6. Parameter Control SYNC/Address Register (PCSAR)–(R/W)
BIT
NAME
MODE
FUNCTION
00–07
S/AR
BOP
SYNC/address register. Contains the secondary station address if the MPCC is a secondary
station. The contents of this register is compared with the first received non-FLAG character
to determine if the message is meant for this station.
SYNC character is loaded into this register by the processor. It is used for receive and
transmit bit synchronization with bit length specified by RxCL and TxCL.
Error Control Mode
10
9
8
CRC–CCITT preset to 1’s
0
0
0
CRC–CCITT preset to 0’s
0
0
1
Not used
0
1
0
CRC–16 preset to 0’s
0
1
1
VRC odd
1
0
0
VRC even
1
0
1
Not used
1
1
0
No error control
1
1
1
ECM should be loaded by the processor during initialization or when both data paths are idle.
BCP
08–10
ECM
BOP/BCP
Suggested Mode
BOP
BCP
–––
BCP
BCP
BCP
–––
BCP/BOP
Char. length
1–8
8
8
5–7
5–7
5–8
11
IDLE
Determines line fill character to be used if transmitter underrun occurs (TxU asserted and
TERR set) and transmission of special characters for BOP/BCP.
IDLE = 0, transmit ABORT characters during underrun and when TABORT = 1.
IDLE = 1, transmit FLAG characters during underrun and when TABORT = 1.
IDLE = 0 transmit initial SYNC characters and underrun line fill characters from theS/AR.
IDLE = 1 transmit initial SYNC characters from TxDB and marks TxSO during underrun.
Secondary Address Mode = 1 if the MPCC is a secondary station. This facilitates automatic
recognition of the received secondary station address. When transmitting, the processor must
load the secondary address into TxDB.
SAM = 0 inhibits the received secondary address comparison which serves to activate the
receiver after the first non-FLAG character has been received.
BOP
BCP
12
SAM
BOP
13
SS/GA
Strip SYNC/Go Ahead. Operation depends on mode.
SS/GA = 1 is used for loop mode only and enables GA detection. When a GA is detected as a
closing character, REOM and RAB/GA will be set and the processor should terminate the
repeater function. SS/GA = 0 is the normal mode which enables ABORT detection. It causes
the receiver to terminate the frame upon detection of an ABORT or FLAG.
SS/GA = 1, causes the receiver to strip SYNC’s immediately following the first two SYNC’s
detected. SYNC’s in the middle of a message will not be stripped. SS/GA = 0, presents any
SYNC’s after the initial two SYNC’s to the processor.
BOP
BCP
14
PROTO
Determines MPCC Protocol mode
PROTO = 0
PROTO = 1
BOP
BCP
15
APA
BOP
All parties address. If this bit is set, the receiver data path is enabled by an address field of
‘11111111’ as well as the normal secondary station address.
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