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參數(shù)資料
| 型號(hào)： | MC68HC05JB4DW |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁(yè)數(shù)： | 43/134頁(yè) |
| 文件大?。?/td> | 2440K |
| 代理商： | MC68HC05JB4DW |
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Figure 1-2. MC68HC05JB4 Pin Assignment
1.4
FUNCTIONAL PIN DESCRIPTION
The following paragraphs give a description of the general function of each pin
assigned in Fig. 1-2 and Fig. 1-3.
1.4.1 VDD AND VSS
Power is supplied to the MCU through VDD and VSS. VDD is the positive supply,
and VSS is ground. The MCU operates from a single power supply.
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, special care should be taken to provide good power supply
bypassing at the MCU by using bypass capacitors with good high-frequency char-
acteristics that are positioned as close to the MCU as possible. Bypassing
requirements vary, depending on how heavily the MCU pins are loaded.
1.4.2 OSC1, OSC2
The OSC1 and OSC2 pins are the connections for the on-chip oscillator. The
OSC1 and OSC2 pins can accept the following sets of components:
1.
A crystal as shown in Figure 1-3(a)
2.
A ceramic resonator as shown in Figure 1-3(a)
3.
An external clock signal as shown in Figure 1-3(b)
The frequency, fOSC, of the oscillator or external clock source is divided by two to
produce the internal operating frequency, fOP. If the internal operating frequency is
3MHz, then the external oscillator frequency will be 6MHz. For LS USB 1.5MHz
28
27
26
25
24
23
22
21
20
19
18
1
2
3
4
5
6
7
8
9
10
11
PA5
VSS
PA4/IRQ2
IRQ
PA6
PB2
RESET
OSC1
OSC2
PB3/AD4
PB4/AD5
PC0/AD0
PC2/AD2
PC1/AD1
PC4/VRH
PC5/VRL
3.3V
12
13
14
PA2
PA3
17
16
15
D+
D–
VDD
PC3/AD3
PA1
PA0
PA7
PB1
PB0/ICAP1
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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