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參數(shù)資料
| 型號： | MB90F498GPMC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | 12 X 12 MM, 1.70 MM HEIGHT, 0.65 MM PITCH, PLASTIC, LFQFP-64 |
| 文件頁數(shù)： | 7/96頁 |
| 文件大?。?/td> | 2317K |
| 代理商： | MB90F498GPMC |
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MB90495G Series
DS07-13713-6E
15
A/D Converter Power-up and Analog Input Initiation Sequence
Make sure to power up the A/D converter and analog input (pins AN0 to AN7) after turning on digital power
(VCC) .
Turn off digital power after turning off the A/D converter power supply and analog inputs. In this case, make
sure that the voltage of AVR does not exceed AVCC (it is permissible to turn off analog and digital power
simultaneously) .
Connecting Unused A/D Converter Pins
If you are not using the A/D converter, set unused pins to AVCC
= AVR = VCC, AVSS = VSS.
Notes for Powering Up
Ensure that the voltage step-up time (between 0.2 V and 2.7 V) at power-up is no less than 50
μs, in order to
prevent malfunction in the built-in step-down circuit.
Initialization
The device contains built-in registers which are only initialized by a power-on reset. Cycle the power supply to
initialize these registers.
Stabilizing the Power Supply
Make sure that the VCC power supply voltage is stable. Even at the rated operating VCC power supply voltage,
large, sudden changes in the voltage could cause malfunctions. As a standard for stable power supply, keep
VCC ripples (peak-to-peak value) at commercial power frequencies (50 Hz / 60 Hz) to no more than 10
% of the
power supply voltage, and momentary surges caused by switching the power supply and other events to more
than 0.1 V/ms.
If Output from Ports 0/1 Becomes Undefined
After power is turned on, if the RST pin is set to “H” during step-down circuit stabilization standby (during power-
on reset) , ports 0 and 1 output will be undefined. If the RST pin is set to “L”, ports 0 and 1 will go into a high
impedance state. Take careful note of the timing of events outlined in figures 1 and 2.
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