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参数资料
| 型号： | MC68HC681FN |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 10/88页 |
| 文件大小： | 726K |
| 代理商： | MC68HC681FN |
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MOTOROLA
MC68HC681 USER’S MANUAL
2-1
2
SECTION 2
SIGNAL DESCRIPTIONS
This section briefly describes the input and output signals. Table 2-1 provides a quick
reference for determining a signal’s pin number, its use as an input or output, whether it is
active high or low, and the section that contains more information about its operation.
NOTE
The terms assertion and negation will be used extensively to
avoid confusion when dealing with a mixture of "active low" and
"active high" signals. The term assert or assertion indicates
that a signal is active or true, independent of whether that level
is represented by a high or low voltage. The term negate or
negation indicates that a signal is inactive or false.
Table 2-1. Signal Summary
SIGNAL NAME
MNEMONIC
PIN NO.
IN/OUT
ACTIVE
STATE
REFER TO
PARA. NO.
P PKG.
FN PKG.
Power Supply (5 V)
VCC
40
44
In
High
2.1
Ground
GND
20
22
In
Low
2.1
Crystal Input or External Clock
X1
32
36
In
—
2.2
Crystal Output
X2
33
37
Out
—
2.3
Reset
RESET
34
38
In
Low
2.4
Chip Select
CS
35
39
In
Low
2.5
Read/Write
R/W
8
9
In
High/Low
2.6
Data Transfer Acknowledge
DTACK
9
10
Out1
Low
2.7
Register-Select Bus Bit 4
RS4
6
7
In
High
2.8
Register-Select Bus Bit 3
RS3
5
6
In
High
2.8
Register-Select Bus Bit 2
RS2
3
4
In
High
2.8
Register-Select Bus Bit 1
RS1
1
2
In
High
2.8
Bidirectional-Data Bus Bit 7
D7
19
21
In/Out
High
2.9
Bidirectional-Data Bus Bit 6
D6
22
25
In/Out
High
2.9
Bidirectional-Data Bus Bit 5
D5
18
20
In/Out
High
2.9
Bidirectional-Data Bus Bit 4
D4
23
26
In/Out
High
2.9
Bidirectional-Data Bus Bit 3
D3
17
19
In/Out
High
2.9
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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