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| 型號： | MC68332AVFC20 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-Bit Modular Microcontroller |
| 中文描述： | 32-BIT, 20.97 MHz, MICROCONTROLLER, PQFP132 |
| 封裝： | PLASTIC, QFP-132 |
| 文件頁數(shù)： | 80/88頁 |
| 文件大小： | 446K |
| 代理商： | MC68332AVFC20 |
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MOTOROLA
80
MC68332
MC68332TS/D
Writing a value of zero to SCBR disables the baud rate generator.
The following table lists the SCBR settings for standard and maximum baud rates using 16.78-MHz and
20.97-MHz system clocks.
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))
PT — Parity Type
0 = Even parity
1 = Odd parity
When parity is enabled, PT determines whether parity is even or odd for both the receiver and the trans-
mitter.
Table 27 SCI Baud Rates
Nominal Baud Rate
Actual Rate with
16.78-MHz Clock
64.0
110.0
299.9
599.9
1199.7
2405.0
4810.0
9532.5
19418.1
37449.1
74898.3
524288.0
SCBR Value
Actual Rate with
20.97-MHz Clock
—
110.0
300.1
600.1
1200.3
2400.6
4783.6
9637.6
19275.3
38550.6
72817.8
655360.0
SCBR Value
64*
110
300
600
1200
2400
4800
9600
19200
38400
76800
$1FFF
$129E
$06D4
$036A
$0165
$00DA
$006D
$0037
$0016
$000E
$0007
$0001
—
$1745
$0888
$0444
$0222
$0111
$0089
$0044
$0022
$0011
$0009
$0001
Maximum Rate
SCCR1
— SCI Control Register 1
$YFFC0A
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
LOOPS WOMS
ILT
PT
PE
M
WAKE
TIE
TCIE
RIE
ILIE
TE
RE
RWU
SBK
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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