mc68hc05x4dw Freescale Semiconductor, Inc, mc68hc05x4dw Datasheet - Page 23

• Manufacturer Part Number: mc68hc05x4dw
• Description: Xc68hc705x4 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Pin descriptions
VDD and VSS
11-modes
MDS/TCAP (VPP)
PB7/TCMP
Power is supplied to the microcomputer via these two pins. VDD is the
positive supply and VSS is ground.
It is in the nature of CMOS designs that very fast signal transitions occur
on the MCU pins. These short rise and fall times place very high
short-duration current demands on the power supply. To prevent noise
problems, special care must be taken to provide good power supply
by-passing at the MCU. By-pass capacitors should have good
high-frequency characteristics and be as close to the MCU as possible.
By-passing requirements vary, depending on how heavily the MCU pins
are loaded.
RESET
OSC1
OSC2
VSS
Freescale Semiconductor, Inc.
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
For More Information On This Product,
Modes of Operation and Pin Descriptions
Figure 6. 28-pin SOIC pinout
Go to: www.freescale.com
2
3
4
5
6
7
8
9
10
11
12
13
14
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Modes of Operation and Pin Descriptions
PB6
PB5
PB4
PB3
PB2
PB1
PB0
VDDH
RX1
RX0
VSS1
TX1
TX0
VDD
MC68HC05X4 Rev 1.0
Pin descriptions