
Technical Data
MC68HC11E Family
—
Rev. 4
32
Pin Descriptions
MOTOROLA
Pin Descriptions
Figure 2-5. Pin Assignments for 48-Pin DIP (MC68HC811E2)
2.3 V
DD
and V
SS
Power is supplied to the MCU through V
DD
and V
SS
. V
DD
is the power
supply, V
SS
is ground. The MCU operates from a single 5-volt (nominal)
power supply. Low-voltage devices in the E series operate at
3.0
–
5.5 volts.
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, provide good power supply bypassing at the
MCU. Also, use bypass capacitors that have good
PB7/ADDR15
PB6/ADDR14
PB5/ADDR13
PB4/ADDR12
PB3/ADDR11
PB2/ADDR10
PB1/ADDR9
PB0/ADDR8
PE0/AN0
PE1/AN1
MC68HC811E2
9
10
11
12
13
14
15
16
17
18
19
20
21
PE2/AN2
PE3/AN3
V
RL
V
RH
V
SS
22
23
MODB/V
STBY
24
PA0/IC3
8
PA1/IC2
7
PA2/IC1
6
PA3/OC5/IC4/OC1
5
PA4/OC4/OC1
4
PA5/OC3/OC1
3
PA6/OC2/OC1
2
PA7/PAI/OC1
1
PC7/ADDR7/DATA7
PC6/ADDR6/DATA6
PC5/ADDR5/DATA5
PC4/ADDR4/DATA4
PC3/ADDR3/DATA3
PC2/ADDR2/DATA2
PC1/ADDR1/DATA1
PC0/ADDR0/DATA0
XTAL
EXTAL
STRB/R/W
E
38
37
36
35
34
33
32
31
30
29
28
27
RESET
39
XIRQ
40
STRA/AS
MODA/LIR
26
25
IRQ
41
PD0/RxD
42
PD1/TxD
43
PD2/MISO
44
PD3/MOSI
45
PD4/SCK
46
PD5/SS
47
V
DD
48