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MC68B912B32 Datenblatt(PDF) 10 Page - Motorola, Inc

Teilenummer MC68B912B32
Bauteilbeschribung  16-Bit Microcontroller
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Hersteller  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC68B912B32 Datenblatt(HTML) 10 Page - Motorola, Inc

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MOTOROLA
MC68HC912B32
10
MC68HC912B32TS/D
3.2 Power Supply Pins
MC68HC912B32 power and ground pins are described below and summarized in Table 4.
3.2.1 Internal Power (VDD) and Ground (VSS)
Power is supplied to the MCU through VDD and VSS. Because fast signal transitions place high, short-
duration current demands on the power supply, use bypass capacitors with high-frequency character-
istics and place them as close to the MCU as possible. Bypass requirements depend on how heavily
the MCU pins are loaded.
3.2.2 External Power (VDDX) and Ground (VSSX)
External power and ground for I/O drivers. Because fast signal transitions place high, short-duration cur-
rent 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.
3.2.3 VDDA, VSSA
Provides operating voltage and ground for the analog-to-digital converter. This allows the supply volt-
age to the A/D to be bypassed independently.
3.2.4 Analog-to-Digital Reference Voltages (VRH, VRL)
3.2.5 VFP
Flash EEPROM programming voltage and supply voltage during normal operation.
3.2.6 VPP
High voltage supply to EEPROM. Used to monitor charge pump output and testing. Not intended for
general applications use.
Table 4 MC68HC912B32 Power and Ground Connection Summary
Mnemonic
Pin Number
Description
VDD
10, 47
Internal power and ground.
VSS
11, 48
VDDX
31, 78
External power and ground, supply to pin drivers.
VSSX
30, 77
VDDA
59
Operating voltage and ground for the analog-to-digital converter,
allows the supply voltage to the A/D to be bypassed independently.
VSSA
60
VRH
49
Reference voltages for the analog-to-digital converter.
VRL
50
VFP
69
Programming voltage for the Flash EEPROM and required supply
for normal operation.
VPP
37
High voltage supply to EEPROM used for test purposes only in
special modes.


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