MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 47

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

3.3.7 V
3.4 Signal Descriptions
3.4.1 Crystal Driver and External Clock Input (XTAL, EXTAL)
3.4.1.1 Crystal Connections
MC68HC912DT128A — Rev 4.0
MOTOROLA
Mnemonic
V
V
V
V
V
V
V
V
V
V
V
DDPLL
V
SSPLL
V
STBY
DDX
SSX
DDA
SSA
RH1
RH0
RL1
RL0
DD
SS
STBY
Table 3-1. MC68HC912DT128A Power and Ground Connection Summary
112-pin QFP
Pin Number
42, 107
40, 106
12, 65
14, 66
85
88
86
87
67
68
43
45
41
Stand-by voltage supply to static RAM. Used to maintain the contents of
RAM with minimal power when the rest of the chip is powered down.
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.
Refer to
Internal power and ground.
External power and ground, supply to pin drivers.
Operating voltage and ground for the analog-to-digital converter, allows the
Reference voltages for the analog-to-digital converter 1
Reference voltages for the analog-to-digital converter 0.
Provides operating voltage and ground for the Phase-Locked Loop. This allows
Stand-by voltage supply to maintain the contents of RAM with minimal power
supply voltage to the A/D to be bypassed independently.
the supply voltage to the PLL to be bypassed independently.
when the rest of the chip is powered down.
Section 13. Oscillator
Pinout and Signal Descriptions
for details of crystal connections.
Description
Pinout and Signal Descriptions
Signal Descriptions
Technical Data
47