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參數資料
| 型號： | MC68HC916X1 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 16-Bit Modular Microcontroller(16位模塊化微控制器) |
| 中文描述： | 16位微控制器模塊（16位模塊化微控制器） |
| 文件頁數： | 119/172頁 |
| 文件大小： | 1035K |
| 代理商： | MC68HC916X1 |
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MC68HC916X1
MC68HC916X1TS/D
MOTOROLA
119
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 receive data
register, and RDRF is still set. Data transfer is inhibited until OR is cleared. Previous data in receive
data register 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.
FE — Framing Error Flag
0 = No framing error on the received data.
1 = Framing error or break occurred on the received data.
FE is set when the SCI receiver detects a zero where a stop bit was to have occurred. FE is not set until
the entire frame is received and RDRF is set. A break can also cause FE to be set. It is possible to miss
a framing error if RXD happens to be at logic level one at the time the stop bit is expected.
PF — Parity Error Flag
0 = No parity error on the received data
1 = Parity error occurred on the received data
PF is set when the SCI receiver detects a parity error. PF is not set until the entire frame is received and
RDRF is set.
SCDR contains two data registers at the same address. The receive data register is a read-only
register that contains data received by the SCI. The data comes into the receive serial shifter and
is transferred to the receive data register. The transmit data register is a write-only register that con-
tains data to be transmitted. The data is first written to the transmit data register, then transferred
to the transmit serial shifter, where additional format bits are added before transmission. R[7:0]/
T[7:0] contain either the first eight data bits received when SCDR is read, or the first eight data bits
to be transmitted when SCDR is written. R8/T8 are used when the SCI is configured for 9-bit oper-
ation. When it is configured for 8-bit operation, they have no meaning or effect.
SCDR
— SCI Data Register
$YFFC0E
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
R8/T8
R7/T7
R6/T6
R5/T5
R4/T4
R3/T3
R2/T2
R1/T1
R0/T0
RESET:
0
0
0
0
0
0
0
U
U
U
U
U
U
U
U
U
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