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參數(shù)資料
| 型號： | MB90F439 |
| 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)： | 17/58頁 |
| 文件大?。?/td> | 629K |
| 代理商： | MB90F439 |
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MB90435 Series
17
(6) Pull-up/down resistors
The MB90435 Series does not support internal pull-up/down resistors (except Port0
Port3 : pull-up
resistors) . 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 ground
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) Initialization
In the device, there are internal registers which are initialized only by a power-on reset. To initialize these registers,
please turn on the power again.
(13) Directions of “DIV A, Ri” and “DIVW A, RWi” instructions
In the Signed multiplication and division instructions (“DIV A, Ri” and “DIVW A, RWi”) , the value of the
corresponding bank register (DTB, ADB, USB, SSB) is set in “00
H
”.
If the values of the corresponding bank registers (DTB, ADB, USB, SSB) are set to other than “00
H
”, the remainder
by the execution result of the instruction is not stored in the register of the instruction operand.
(14) Using REALOS
The use of EI
2
OS is not possible with the REALOS real time operating system.
(15) Caution on Operations during PLL Clock Mode
If the PLL clock mode is selected, the microcontroller attempt to be working with the self-oscillating circuit even
when there is no external oscillator or external clock input is stopped. Performance of this operation, however,
cannot be guaranteed.
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