MC68HC912BD32 Datasheet, PDF (24/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Pinout and Signal Descriptions
Table 4 MC68HC912BD32 Power and Ground Connection Summary
Mnemonic Pin Number
Description
V_DD
V_SS
V_DDX
V_SSX
V_DDA
V_SSA
V_RH
V_RL
V_FP
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.
Signal Descriptions
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 four times the desired E–clock
rate (in normal operation with DIVBYP=0; refer to Clock Divider Bypass
(DIVBYP)) All the device clocks are derived from the EXTAL input
frequency.
EXTAL
MCU
XTAL
10 MΩ
C
4 x E (DIVBYP=0)
2 x E (DIVBYP=1)
CRYSTAL _C
Figure 4 Common Crystal Connections
MC68HC912BD32 Rev 1.0
Pinout and Signal Descriptions
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4-pins