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| 型號： | MC68HC2681FN |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 53/88頁 |
| 文件大?。?/td> | 726K |
| 代理商： | MC68HC2681FN |
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Electrical Specifications
MOTOROLA
MC68HC681 USER’S MANUAL
5-3
5
5.5 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
5.5.1 Clock Timing
Figure 5-1. 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 Clock Frequency (RxC)
16X Clock
1X Clock
fRx
0
4.0
1.0
MHz
Receive Clock (RxC) High or Low Time
tRx
100
—
ns
Transmitter Clock Frequency (TxC)
16X Clock
1X Clock
fTx
0
4.0
1.0
MHz
Transmit Clock (TxC) High or Low
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 inSection 4.2 Register Bit Formats, the X1 frequency should
be set to 3.6864 MHz or a 3.6864 MHz crystal should be connected across pins X1 and X2.
t
f
tr
t CLK
t CTC
t Rx
t Tx
t
CLK
t CTC
t Rx
t Tx
X1
C/T CLK
RxC
TxC
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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