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MC68B912B32 Datenblatt(PDF) 10 Page - Motorola, Inc |
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MC68B912B32 Datenblatt(HTML) 10 Page - Motorola, Inc |
10 / 128 page 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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Ähnliche Beschreibung - MC68B912B32 |
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