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參數(shù)資料
| 型號： | SPAKXC16Z1VFC20 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, 20 MHz, MICROCONTROLLER, PQFP132 |
| 封裝： | PLASTIC, SMT-132 |
| 文件頁數(shù)： | 197/200頁 |
| 文件大?。?/td> | 1383K |
| 代理商： | SPAKXC16Z1VFC20 |
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MOTOROLA
MC68HC16Z1
96
MC68HC16Z1TS/D
If an internal SCI signal for setting a status bit comes after the CPU has read the asserted status bits,
but before the CPU has written or read register SCDR, the newly set status bit is not cleared. SCSR
must be read again with the bit set. Also, SCDR must be written or read before the status bit is cleared.
Reading either byte of SCSR causes all 16 bits to be accessed. Any status bit already set in either byte
will be cleared on a subsequent read or write of register SCDR.
TDRE — Transmit Data Register Empty Flag
0 = Register TDR still contains data to be sent to the transmit serial shifter.
1 = A new character can now be written to register TDR.
TDRE is set when the byte in register TDR is transferred to the transmit serial shifter. If TDRE is zero,
transfer has not occurred and a write to TDR will overwrite the previous value. New data is not trans-
mitted if TDR is written without first clearing TDRE.
TC — Transmit Complete Flag
0 = SCI transmitter is busy
1 = SCI transmitter is idle
TC is set when the transmitter finishes shifting out all data, queued preambles (mark/idle line), or
queued breaks (logic zero). The interrupt can be cleared by reading SCSR when TC is set and then by
writing the transmit data register (TDR) of SCDR.
RDRF — Receive Data Register Full Flag
0 = Register RDR is empty or contains previously read data.
1 = Register RDR contains new data.
RDRF is set when the content of the receive serial shifter is transferred to the RDR. If one or more errors
are detected in the received word, flag(s) NF, FE, and/or PF are set within the same clock cycle.
RAF — Receiver Active Flag
0 = SCI receiver is idle
1 = SCI receiver is busy
RAF indicates whether the SCI receiver is busy. It is set when the receiver detects a possible start bit
and is cleared when the chosen type of idle line is detected. RAF can be used to reduce collisions in
systems with multiple masters.
IDLE — Idle-Line Detected Flag
0 = SCI receiver did not detect an idle-line condition.
1 = SCI receiver detected an idle-line condition.
IDLE is disabled when RWU in SCCR1 is set. IDLE is set when the SCI receiver detects the idle-line
condition specified by ILT in SCCR1. If cleared, IDLE will not set again until after RDRF is set. RDRF
is set when a break is received, so that a subsequent idle line can be detected.
OR — Overrun Error Flag
0 = RDRF is cleared before new data arrives.
1 = RDRF is not cleared before new data arrives.
OR is set when a new byte is ready to be transferred from the receive serial shifter to the RDR, and
RDRF is still set. Data transfer is inhibited until OR is cleared. Previous data in RDR remains valid, but
data received during overrun condition (including the byte that set OR) is lost.
NF — Noise Error Flag
0 = No noise detected on the received data
1 = Noise occurred on the received data
NF is set when the SCI receiver detects noise on a valid start bit, on any data bit, or on a stop bit. It is
not set by noise on the idle line or on invalid start bits. Each bit is sampled three times. If none of the
three samples are the same logic level, the majority value is used for the received data value, and NF
is set. NF is not set until an entire frame is received and RDRF is set.
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