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參數(shù)資料
| 型號： | SCN68652AC2N40 |
| 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, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 651K |
| 代理商： | SCN68652AC2N40 |
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Philips Semiconductors
Product specification
SCN2652/SCN68652
Multi-protocol communications controller (MPCC)
1995 May 01
15
Table 7. Transmit Data/Status Register (TDSR) (R/W except TDSR15)
BIT
NAME
MODE
FUNCTION
00–07
TxDB
BOP/BCP
Transmit data buffer. Contains processor loaded characters to be serialized in TxSR and
transmitted on TxSO.
Transmitter start of message. Set by the processor to initiate message transmission provided
TxE = 1.
TSOM = 1 generates FLAGs. When TSOM = 0 transmission is from TxDB and FCS
generation (if specified) begins. FCS, as specified by PCSAR
8–10
, should be CRC–CCITT
preset to 1’s.
TSOM = 1 generates SYNCs from PCSAR
L
or transmits from TxDB for IDLE = 0 or 1
respectively. When TSOM = 0 transmission is from TxDB and CRC generation (if specified)
begins.
08
TSOM
BOP
BCP
09
TEOM
Transmit end of message. Used to terminate a transmitted message.
TEOM = 1 causes the FCS and the closing FLAG to be transmitted following the transmission
of the data character in TxSR. FLAGs are transmitted until TEOM = 0. ABORT or GA are
transmitted if TABORT or TGA are set when TEOM = 1.
TEOM = 1 causes CRC–16 to be transmitted (if selected) followed by SYNCs from PCSAR
L
or TxDB (IDLE = 0 or 1). Clearing TEOM prior to the end of CRC–16 transmission (when
TxBE = 1) causes TxSO to be marked following the CRC–16. TxE must be dropped before a
new message can be initiated. If CRC is not selected, TEOM should not be set.
BOP
BCP
10
TABORT
BOP
Transmitter abort = 1 will cause ABORT or FLAG to be sent (IDLE = 1 or 1) after the current
character is transmitted. (ABORT = 11111111)
Transmit go ahead (GA) instead of FLAG when TEOM = 1. This facilitates repeater
termination in loop mode. (GA = 01111111)
11
TGA
BOP
12–14
Not Defined
15
TERR
Read
only
Transmitter error = 1 indicates the TxDB has not been loaded in time (one character time–1/2
TxC period after TxBE is asserted) to maintain continuous transmission. TxU will be asserted
to inform the processor of this condition. TERR is cleared by setting TSOM. See timing
diagram.
ABORT’s or FLAG’s are sent as fill characters (IDLE = 0 or 1)
SYNC’s or MARK’s are sent as fill characters (IDLE = 0 or 1). For IDLE = 1 the last character
before underrun is not valid.
BOP
BCP
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