mc68hc912bd32 Freescale Semiconductor, Inc, mc68hc912bd32 Datasheet - Page 24

• Manufacturer Part Number: mc68hc912bd32
• Description: 16-bit Device Composed Of Standard On-chip Peripherals
• Manufacturer: Freescale Semiconductor, Inc

Signal Descriptions
Crystal Driver and
External Clock
Input (XTAL, EXTAL)
Pinout and Signal Descriptions
MC68HC912BD32 Rev 1.0
Mnemonic Pin Number
V
V
V
V
V
V
V
V
V
DDX
DDA
SSX
SSA
DD
RH
SS
RL
FP
Table 4 MC68HC912BD32 Power and Ground Connection Summary
10, 47
11, 48
31, 78
30, 77
59
60
49
50
69
Internal power and ground.
External power and ground, supply to pin drivers.
Operating voltage and ground for the analog-to-digital converter, allows the supply
voltage to the A/D to be bypassed independently.
Reference voltages for the analog-to-digital converter.
Programming voltage for the Flash EEPROM and required supply for normal
operation.
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 four times the desired E–clock
rate (in normal operation with DIVBYP=0; refer to
(DIVBYP)) All the device clocks are derived from the EXTAL input
frequency.
Freescale Semiconductor, Inc.
For More Information On This Product,
Pinout and Signal Descriptions
MCU
Go to: www.freescale.com
Figure 4 Common Crystal Connections
EXTAL
XTAL
Description
10 M
CRYSTAL
4 x E (DIVBYP=0)
2 x E (DIVBYP=1)
Clock Divider Bypass
C
C
4-pins