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參數(shù)資料
| 型號： | MC68HC681P |
| 廠商： | MOTOROLA 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)： | 70/88頁 |
| 文件大?。?/td> | 461K |
| 代理商： | MC68HC681P |
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MC68HC2681
MOTOROLA
MC68HC681 USER’S MANUAL
A-3
A
Table A-1. MC68HC2681 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
High
A.2.1
Chip Select
CS
35
39
In
Low
A.2.2
Write Strobe
W
8
9
In
Low
A.2.3
Read Strobe
R
9
10
In
Low
A.2.4
Register-Select Bus Bit 4
RS4
6
7
In/Out
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
Bidirectional-Data Bus Bit 2
D2
24
27
In/Out
High
2.9
Bidirectionai-Data Bus Bit 1
D1
16
18
In/Out
High
2.9
Bidirectional-Data Bus Bit 0
D0
25
28
In/Out
High
2.9
Interrupt Request
IRQ
21
24
Out 1
Low
2.10
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 6
IP6
37
41
In
—
A.2.5
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
—
A.2.6
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 pull-up resistor.
2.
May require a pull-up resistor, depending on its programmed function.
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