MC68HC11PH8 Datasheet, PDF (28/264 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

2
NC 1
NC 2
PW1/PH0 3
PW2/PH1 4
PW3/PH2 5
PW4/PH3 6
PH4 7
PH5 8
PH6 9
PH7 10
NC 11
MODB/VSTBY 12
VPPE/XIRQ 13
NC 14
VDDL 15
VSSL 16
NC 17
NC 18
R/W/PG7 19
LCDBP/PG6 20
SS2/PG5 21
SCK2/PG4 22
MOSI2/PG3 23
MISO2/PG2 24
TXD2/PG1 25
NC 26
NC 27
NC 28
84 NC
83 PD2/MISO
82 PD1/TXD
81 PD0RXD
80 MODA/LIR
79 RESET
78 XFC
77 VDDSYN
76 NC
75 NC
74 NC
73 EXTAL
72 XTAL
71 E
70 4XOUT
69 VDDR
68 VSSR
67 PC7/D7
66 PC6/D6
65 PC5/D5
64 PC4/D4
63 PC3/D3
62 PC2/D2
61 PC1/D1
60 PC0/D0
59 IRQ
58 NC
57 NC
Figure 2-2 112-pin TQFP pinout
2.1
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-frequency characteristics and be as close to the MCU as
possible. Bypassing requirements vary, depending on how heavily the MCU pins are loaded.
The MC68HC11PH8 MCU has five VDD pins and five VSS pins. One pair of these pins is reserved for
supplying power to the analog-to-digital converter (VDD AD, VSS AD); two pairs are used for the
internal logic (VDD, VSS); the remaining two pairs supply power for the port logic on either half of the
chip (VDDL, VSSL and VDDR, VSSR). This arrangement minimizes the injection of noise into the
digital circuitry on the chip.
MOTOROLA
2-2
PIN DESCRIPTIONS
TPG
MC68HC11PH8