Freescale Semiconductor, Inc.
Pin Descriptions
4
5
4
3
2
I
I
O
O
O
O
P
K
1
3
2
1
A
A
/
A
/
/
/
/
D
S
S
3M/ SO
A
A
A
A
A
B
B
B
B
B
B
B
B
S
D
A
A
A
P
P
P
P
P
D
D
D
9
8
7
6
5
4
3
2
1
0
4
3
2
1
0
9
8
7
6
5
PW1/PH0 12
PW2/PH1 13
PW3/PH2 14
PW4/PH3 15
RXD2/PH4 16
TXD2/PH5 17
RXD3/PH6 18
TXD3/PH7 19
MODB/VSTBY 20
XIRQ 21
74 PD2/MISO
73 PD1/TXD1
72 PD0/RXD1
71 MODA/LIR
70 RESET
69 XFC
68 VDDSYN
67 EXTAL
66 XTAL
65
E
VDD 22
VDDL 23
VSSX 24
VSS 25
64 VDDR
63 VSSX
62 PC7/D7
61 PC6/D6
60 PC5/D5
59 PC4/D4
58 PC3/D3
57 PC2/D2
56 PC1/D1
55 PC0/D0
54 IRQ
R/W/PG7 26
PG6 27
PG5 28
PG4 29
PG3 30
PG2 31
PG1 32
Figure 2-1. 84-pin PLCC/CERQUAD pinout
2.3 VDD and VSS
Power is supplied to the microcontroller via these pins. VDD is the
positive supply and VSS is ground. The MCU operates from a single 5V
(nominal) power supply.
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
bypassing at the MCU. Bypass capacitors should have good high-
Technical Data
MC68HC11P2 — Rev 1.0
Pin Descriptions
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