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| 型號(hào)： | MC68HC2681P |
| 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, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 11/88頁 |
| 文件大?。?/td> | 726K |
| 代理商： | MC68HC2681P |
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Signal Descriptions
2-2
MC68HC681 USER’S MANUAL
MOTOROLA
2
2.1 VCC AND GND
Power is supplied to the DUART using these two signals. VCC is power ( + 5 volts) and GND
is the ground connection.
2.2 CRYSTAL INPUT OR EXTERNAL CLOCK (X1)
This input is one of two connections to a crystal or a connection to an external CMOS-level
clock. If a crystal is used, a capacitor of approximately 10 to 15 picofarads should be
connected from this pin to ground.
Bidirectional-Data Bus Bit 2
D2
24
27
In/Out
High
2.9
Bidirectional-Data Bus Bit 1
D1
16
18
In/Out
High
2.9
Bidirectional-Data Bus Bit 0
(Least-Significant Bit)
D0
25
28
In/Out
High
2.9
Interrupt Request
IRQ
21
24
Out 1
Low
2.10
Interrupt Acknowledge
IACK
37
41
In
Low
2.11
Channel A Transmitter Serial Data
TxDA
30
33
Out
—
2.12
Channel A Receiver Serial Data
RxDA
31
35
In
—
2.13
Channel B Transmitter Serial Data
TxDB
11
13
Out
—
2.14
Channel B Receiver Serial Data
RxDB
10
11
In
—
2.15
Parallel Input 5
IP5
38
42
In
—
2.16.1
Parallel Input 4
IP4
39
43
In
—
2.16.2
Parallel Input 3
IP3
2
3
In
—
2.16.3
Parallel Input 2
IP2
36
40
In
—
2.16.4
Parallel Input 1
IP1
4
5
In
—
2.16.5
Parallel Input 0
IP0
7
8
In
—
2.16.6
Parallel Output 7
OP7
15
17
Out 2
—
2.17.1
Parallel Output 6
OP6
26
29
Out 2
—
2.17.2
Parallel Output 5
OP5
14
16
Out 2
—
2.17.3
Parallel Output 4
OP4
27
30
Out 2
—
2.17.4
Parallel Output 3
OP3
13
15
Out 2
—
2.17.5
Parallel Output 2
OP2
28
31
Out
—
2.17.6
Parallel Output 1
OP1
12
14
Out
—
2.17.7
Parallel Output 0
OP0
29
32
Out
—
2.17.8
NOTES:
1.
Requires a pullup resistor
2.
May require a pullup resistor, depending on its programmed function.
Table 2-1. Signal Summary (Continued)
SIGNAL NAME
MNEMONIC
PIN NO.
IN/OUT
ACTIVE
STATE
REFER TO
PARA. NO.
P PKG.
FN PKG.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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