MC68HC11F1_13 Datasheet, PDF (16/158 Pages) Freescale Semiconductor, Inc – Technical Data

Freescale Semiconductor, Inc.
NC
1
NC
2
PB6/ADDR14
3
PB5/ADDR13
4
PB4/ADDR12 5
PB3/ADDR11 6
PB2/ADDR10 7
PB1/ADDR9 8
PB0/ADDR8 9
PF7/ADDR7
10
PF6/ADDR6
11
PF5/ADDR5
12
PF4/ADDR4
13
PF3/ADDR3
14
PF2/ADDR2
15
PF1/ADDR1 16
PF0/ADDR0
17
PE0/AN0
18
PE4/AN4
19
NC
20
MC68HC11F1
60
NC
59
PG1
58
PG2
57
PG3
56
PG4/CSIO2
55
PG5/CSIO1
54
PG6/CSGEN
53
PG7/CSPROG
52
IRQ
51 XIRQ
50
RESET
49
PC7/DATA7
48
PC6/DATA6
47
PC5/DATA5
46
PC4/DATA4
45
PC3/DATA3
44
PC2/DATA2
43
PC1/DATA1
42
NC
41 NC
Figure 2-2 Pin Assignments for MC68HC11F1 80-Pin QFP
2.1 V_{DD and} V_SS
Power is supplied to the MCU through V_DD and V_SS. V_DD is the power supply, and
V_SS is ground. The MCU operates from a single 5-volt (nominal) power supply. Very
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.
PIN DESCRIPTIONS
MC68HC11F1
2-2
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TECHNICAL DATA
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