
Pinout and Signal Descriptions
Advance Information
68HC(9)12D60 — Rev 4.0
44
Pinout and Signal Descriptions
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
3.5 Signal Descriptions
3.5.1 Crystal Driver and External Clock Input (XTAL, EXTAL)
These pins provide the interface for either a crystal or a CMOS
compatible clock to control the internal clock generator circuitry. Out of
reset the frequency applied to EXTAL is twice the desired E–clock rate.
All the device clocks are derived from the EXTAL input frequency.
NOTE:
CRYSTAL CIRCUIT IS CHANGED FROM STANDARD.
Table 3-1. 68HC(9)12D60 Power and Ground Connection Summary
Mnemonic
Pin Number
Description
80-pin
QFP
112-pin
QFP
V
DD
9, 49
12, 65
Internal power and ground.
V
SS
10, 50
14, 66
V
DDX
30, 75
42, 107
External power and ground, supply to pin drivers.
V
SSX
29, 74
40, 106
V
DDA
61
85
Operating voltage and ground for the analog-to-digital
converter, allows the supply voltage to the A/D to be
bypassed independently.
V
SSA
62
88
V
RH1
—
86
Reference voltages for the analog-to-digital converter 1
V
RL1
—
87
V
RH0
51
67
Reference voltages for the analog-to-digital converter 0.
V
RL0
52
68
V
DDPLL
31
43
Provides operating voltage and ground for the Phased-Locked
Loop. This allows the supply voltage to the PLL to be
bypassed independently.
V
SSPLL
33
45
V
FP
71
97
Programming voltage for the Flash EEPROM and required
supply for normal operation. (68HC912D60 only – on the
68HC12D60 this pin is not connected and can be tied to 5V
or 12V without effect)
F
Freescale Semiconductor, Inc.
n
.