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| 型號(hào)： | MC68HC2681P |
| 廠(chǎng)商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁(yè)數(shù)： | 74/88頁(yè) |
| 文件大?。?/td> | 726K |
| 代理商： | MC68HC2681P |
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MC68HC2681
MOTOROLA
MC68HC681 USER’S MANUAL
A-7
A
A.4.12 AC Electrical Characteristics
TA = 0°C to 70°C, VCC = 5.0 V ± 5%
All voltage measurements are referenced to ground (GND). For testing, all input signals
except X1 swing between 0.4 V and 2.4 V with a maximum transition time of 20 ns. For X1,
the swing is between 0.4 V and 4.4 V. All time measurements are referenced at input and
output voltages of 0.8 V and 2.0 V as appropriate. Test conditions for non-interrupt outputs:
CL = pF, RL = to VCC. Test conditions for interrupt outputs: CL =pF, RL = to VCC.
A.4.12.1 CLOCK TIMING
.
Figure A-2. Clock Timing
CHARACTERISTIC
SYMBOL
MIN
MAX
UNIT
X1 Frequency *
fCLK
0
4.0
MHz
X1 High or Low Time
tCLK
100
ns
Counter/Timer Clock Frequency
fCTC
0
16.0
MHz
Counter Timer Clock High or Low Time
tCTC
25
ns
Receiver Frequency
16X Clock
1X Clock
fRx
0
4.0
1.0
MHz
Receive Clock (RxC) High or Low Time
tRx
100
—
ns
Transmitter Frequency
16X Clock
1X Clock
fTx
0
4.0
1.0
MHz
Transmit Clock (TxC) High or Low Time
tTx
100
—
ns
Clock Rise Time
tr
20
ns
Clock Fall Time
tf
20
ns
NOTE:
* For the baud-rate generator to generate the standard baud rates shown in Section 4.2 Register Bit Formats, X1 must be
3.6864 MHz
tf
t r
t
CLK
t CTC
t Rx
t
Tx
t
t Rx
t
X1
C/T
CLK
RxC
TxC
CLK
CTC
Tx
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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