mc68hc11f1cpu3 Freescale Semiconductor, Inc, mc68hc11f1cpu3 Datasheet - Page 16

• Manufacturer Part Number: mc68hc11f1cpu3
• Description: Mc68hc11f1 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

2.1 V
2-2
Power is supplied to the MCU through V
V
fast signal transitions occur on the MCU pins. The short rise and fall times place high,
short duration current demands on the power supply. To prevent noise problems, pro-
vide good power-supply bypassing at the MCU. Also, use bypass capacitors that have
good high-frequency characteristics and situate them as close to the MCU as possible.
Bypass requirements vary, depending on how heavily the MCU pins are loaded.
SS
DD and
is ground. The MCU operates from a single 5-volt (nominal) power supply. Very
PB6/ADDR14
PB5/ADDR13
PB4/ADDR12
PB2/ADDR10
PB3/ADDR11
PB1/ADDR9
PB0/ADDR8
PF7/ADDR7
PF4/ADDR4
PF3/ADDR3
PF6/ADDR6
PF5/ADDR5
PF2/ADDR2
PF0/ADDR0
PF1/ADDR1
PE0/AN0
PE4/AN4
V
Figure 2-2 Pin Assignments for MC68HC11F1 80-Pin QFP
NC
NC
NC
SS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
PIN DESCRIPTIONS
MC68HC11F1
DD
and V
SS
. V
DD
is the power supply, and
53
60
59
58
57
56
55
54
52
50
49
48
47
46
45
44
43
42
51
41
NC
PG1
PG2
PG3
PG4/CSIO2
PG5/CSIO1
PG6/CSGEN
PG7/CSPROG
IRQ
XIRQ
RESET
PC7/DATA7
PC6/DATA6
PC5/DATA5
PC4/DATA4
PC3/DATA3
PC2/DATA2
PC1/DATA1
NC
NC
TECHNICAL DATA
MC68HC11F1