MC68HC912DG128 Datasheet, PDF (42/452 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Pinout and Signal Descriptions
3.3.8 V_STBY
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.
Mnemonic
V_DD
V_SS
V_DDX
V_SSX
V_DDA
V_SSA
V_RH1
V_RL1
V_RH0
V_RL0
V_DDPLL
V_SSPLL
V_FP
V_STBY
Table 3-1. Power and Ground Connection Summary
Pin Number
112-pin QFP
Description
12, 65
14, 66
Internal power and ground.
42, 107
40, 106
External power and ground, supply to pin drivers.
85
Operating voltage and ground for the analog-to-digital converter, allows the
88
supply voltage to the A/D to be bypassed independently.
86
Reference voltages for the analog-to-digital converter 1
87
67
Reference voltages for the analog-to-digital converter 0.
68
43
Provides operating voltage and ground for the Phase-Locked Loop. This allows
45
the supply voltage to the PLL to be bypassed independently.
97
Program/erase voltage for the Flash EEPROM and required supply for normal
operation.
41
Stand-by voltage supply to maintain the contents of RAM with minimal power
when the rest of the chip is powered down.
3.4 Signal Descriptions
3.4.1 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.
Technical Data
42
MC68HC912DG128 — Rev 3.0
Pinout and Signal Descriptions
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