參數資料
型號: MC68331CEH25
廠商: Freescale Semiconductor
文件頁數: 63/84頁
文件大?。?/td> 0K
描述: IC MCU 32BIT 25MHZ 132-PQFP
標準包裝: 36
系列: M683xx
核心處理器: CPU32
芯體尺寸: 32-位
速度: 25MHz
連通性: EBI/EMI,SCI,SPI,UART/USART
外圍設備: POR,PWM,WDT
輸入/輸出數: 18
程序存儲器類型: ROMless
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 132-BQFP 緩沖式
包裝: 托盤
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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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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