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參數(shù)資料
| 型號： | MB90V540 |
| 廠商： | Fujitsu Limited |
| 英文描述： | 16-bit Proprietary Microcontroller |
| 中文描述： | 16位微控制器專有 |
| 文件頁數(shù)： | 16/56頁 |
| 文件大?。?/td> | 757K |
| 代理商： | MB90V540 |
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MB90540/545 Series
16
(6) Pull-up/down resistors
The MB90540/545 Series does not support internal pull-up/down resistors (except Port0 - Port3:pull-up resis-
tors). Use external components where needed.
(7) Crystal Oscillator Circuit
Noises around X0 or X1 pins may be possible causes of abnormal operations. Make sure to provide bypass
capacitors via the shortest distances from X0, X1 pins, crystal oscillator (or ceramic resonator) and ground lines,
and make sure, to the utmost effort, that lines of oscillation circuits do not cross the lines of other circuits.
It is highly recommended to provide a printed circuit board artwork surrounding X0 and X1 pins with a grand
area for stabilizing the operation.
(8) Turning-on Sequence of Power Supply to A/D Converter and Analog Inputs
Make sure to turn on the A/D converter power supply (AV
CC
, AVRH, AVRL) and analog inputs (AN0 to AN7) after
turning-on the digital power supply (V
CC
).
Turn-off the digital power after turning off the A/D converter supply and analog inputs. In this case, make sure
that the voltage does not exceed AVRH or AV
CC
(turning on/off the analog and digital power supplies simulta-
neously is acceptable).
(9) Connection of Unused Pins of A/D Converter
Connect unused pins of A/D converter to AV
CC
= V
CC
, AV
SS
= AVRH = V
SS
.
(10) N.C. Pin
The N.C. (internally connected) pin must be opened for use.
(11) Notes on Energization
To prevent the internal regulator circuit from malfunctioning, set the voltage rise time during energization at
50
μ
s or more (0.2 V to 2.7 V).
(12) Indeterminate outputs from ports 0 and 1
The outputs from 0 and 1 become indeterminate during a power-on reset after the power is turned on.
Pay attention to the port output timing shown as follows.
Oscillation setting time
2
Step-down circuit
setting time
1
Vcc(power-supply pin)
PONR(power-on reset) signal
RST(external asynchronous reset) signal
RST(internal reset) signal
Oscillation clock signal
KA(internal operation clock A) signal
KB(internal operation clock B) signal
PORT(port output)signal
Indereterminate period
* :1:Step-down circuit setting time : 2
17
/oscillation clock frequency (oscillation clock frequency of 16 MHz: 8.19 ms)
* :2:Oscillation setting time: 2
18
/oscillation clock frequency (oscillation cllock frequency of 16 MHz: 16.38 ms)
Timming chart of indeterminate outputs from ports o and 1
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