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参数资料
| 型号： | MC68331CFC25B1 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 25 MHz, MICROCONTROLLER, PQFP132 |
| 封装： | 0.950 X 0.950 INCH, 0.025 INCH PITCH, PLASTIC, QFP-132 |
| 文件页数： | 63/90页 |
| 文件大小： | 481K |
| 代理商： | MC68331CFC25B1 |
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MOTOROLA
MC68331
66
MC68331TS/D
*A rate of 64 baud is not available with a 20.97-MHz system clock. To achieve this rate, the SYNCR can be pro-
grammed to generate a lower system clock rate.
SCCR1 contains SCI configuration parameters. The CPU can read and write this register at any time.
The SCI can modify RWU in some circumstances. In general, interrupts enabled by these control bits
are cleared by reading SCSR, then reading (receiver status bits) or writing (transmitter status bits)
SCDR.
Bit 15 — Not Implemented
LOOPS — Loop Mode
0 = Normal SCI operation, no looping, feedback path disabled
1 = Test SCI operation, looping, feedback path enabled
LOOPS controls a feedback path on the data serial shifter. When loop mode is enabled, SCI transmitter
output is fed back into the receive serial shifter. TXD is asserted (idle line). Both transmitter and receiver
must be enabled before entering loop mode.
WOMS — Wired-OR Mode for SCI Pins
0 = If configured as an output, TXD is a normal CMOS output.
1 = If configured as an output, TXD is an open-drain output.
WOMS determines whether the TXD pin is an open-drain output or a normal CMOS output. This bit is
used only when TXD is an output. If TXD is used as a general-purpose input pin, WOMS has no effect.
ILT — Idle-Line Detect Type
0 = Short idle-line detect (start count on first one)
1 = Long idle-line detect (start count on first one after stop bit(s))
Table 25 SCI Baud Rates
Nominal Baud Rate
Actual Rate with
16.78-MHz Clock
SCBR Value
Actual Rate with
20.97-MHz Clock
SCBR Value
64*
64.0
$1FFF
—
110
110.0
$129E
110.0
$1745
300
299.9
$06D4
300.1
$0888
600
599.9
$036A
600.1
$0444
1200
1199.7
$0165
1200.3
$0222
2400
2405.0
$00DA
2400.6
$0111
4800
4810.0
$006D
4783.6
$0089
9600
9532.5
$0037
9637.6
$0044
19200
19418.1
$0016
19275.3
$0022
38400
37449.1
$000E
38550.6
$0011
76800
74898.3
$0007
72817.8
$0009
Maximum Rate
524288.0
$0001
655360.0
$0001
SCCR1 — SCI Control Register 1
$YFFC0A
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SCBR
RESET:
0
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