MC68HC912BD32 Datasheet, PDF (23/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Pinout and Signal Descriptions
Power Supply Pins
Power Supply Pins
MC68HC912BD32 power and ground pins are described below and
summarized in Table 4.
Internal Power
(V_DD) and Ground
(V_SS)
Power is supplied to the MCU through V_DD and V_SS. Because fast signal
transitions place high, short-duration current demands on the power
supply, use bypass capacitors with high-frequency characteristics and
place them as close to the MCU as possible. Bypass requirements
depend on how heavily the MCU pins are loaded.
External Power
(V_DDX) and
Ground (V_SSX)
External power and ground for I/O drivers. Because fast signal
transitions place high, short-duration current demands on the power
supply, use bypass capacitors with high-frequency characteristics and
place them as close to the MCU as possible. Bypass requirements
depend on how heavily the MCU pins are loaded.
V_DDA, V_SSA
Provides operating voltage and ground for the analog-to-digital
converter. This allows the supply voltage to the A/D to be bypassed
independently.
Analog to Digital
Reference
Voltages (V_RH, V_RL)
V_FP
Flash EEPROM programming voltage and supply voltage during normal
operation.
3-pins
Pinout and Signal Descriptions
For More Information On This Product,
Go to: www.freescale.com
MC68HC912BD32 Rev 1.0