參數(shù)資料
型號(hào): HC805P18GRS
英文描述: 68HC805P18 Technical Data
中文描述: 68HC805P18技術(shù)數(shù)據(jù)
文件頁(yè)數(shù): 13/111頁(yè)
文件大?。?/td> 748K
代理商: HC805P18GRS
GENERAL RELEASE SPECIFICATION
MOTOROLA
1-4
INTRODUCTION
MC68HC805P18
Rev. 1.0
8
2
3
4
5
6
7
8
9
10
11
12
13
14
A
16
17
18
19
20
1.4 Functional Pin Description
The following paragraphs describe the functionality of each pin on the
MC68HC805P18 package. Pins connected to subsystems described in other
sections provide a reference to the section instead of a detailed functional
description.The pinout is shown in Figure 1-2.
Figure 1-2. User Mode Pinout
1.4.1 V
DD
and V
SS
Power is supplied to the MCU through V
DD
and V
SS
. V
DD
is connected to a
regulated positive supply and V
SS
is connected to ground.
Very fast signal transitions occur on the MCU pins. The short rise and fall times
place very high short-duration current demands on the power supply. To prevent
noise problems, take special care to provide good power supply bypassing at the
MCU. Use bypass capacitors with good high-frequency characteristics, and
position them as close to the MCU as possible. Bypassing requirements vary,
depending on how heavily the MCU pins are loaded.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RESET
IRQ
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
SDO/PB5
SDI/PB6
SCK/PB7
V
SS
V
DD
OSC1
OSC2
PD7/TCAP
TCMP
PD5/CKOUT
PC0
PC1
PC2
PC3/AD3
PC4/AD2
PC5/AD1
PC6/AD0
PC7/V
REFH
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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