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68HC705JB3 Datasheet(PDF) 16 Page - Freescale Semiconductor, Inc

Part # 68HC705JB3
Description  8-bit microcontroller units (MCUs)
PDF  134 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

68HC705JB3 Datasheet(HTML) 16 Page - Freescale Semiconductor, Inc

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GENERAL RELEASE SPECIFICATION
November 5, 1998
MOTOROLA
GENERAL DESCRIPTION
MC68HC05JB3
1-4
REV 1
Figure 1-2. MC68HC05JB3 Pin Assignments
1.4
FUNCTIONAL PIN DESCRIPTION
The following paragraphs give a description of the general function of each pin
assigned in Figure 1-2.
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)
28
27
26
25
24
23
22
21
20
19
18
1
2
3
4
5
6
7
8
9
10
11
PA6
PB7
PA5
PB4
PA7
PA3
PB5
D+
D–
PC2
PA2
PA1
RESET
PA0
OSC1
OSC2
VSS
12
13
14
PB2
IRQ
17
16
15
PC0/OCMP
PC1
3.3V
VDD
PB1
PB0/TCAP
PB6
PC3
PA4
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
PA5
IRQ
PA4
PB2
PA7
PA6
PA3
PA2
PA1
RESET
PA0
OSC1
OSC2
VSS
3.3V
D+
D–
VDD
PB0/TCAP
PB1
20-pin package
28-pin package
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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