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參數(shù)資料
| 型號： | M38503M4A-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 6.25 MHz, MICROCONTROLLER, PDSO42 |
| 封裝： | 8.40 X 17.50 MM, 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件頁數(shù)： | 69/90頁 |
| 文件大?。?/td> | 899K |
| 代理商： | M38503M4A-XXXFP |
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Rev.2.10
2005.11.14
page 69 of 86
REJ03B0093-0210
3850 Group (Spec.A)
NOTES ON USAGE
Differences among 3850 group (standard), 3850
group (spec. H), and 3850 group (spec. A)
(1) The absolute maximum ratings of 3850 group (spec. H/A) is
smaller than that of 3850 group (standard).
Power source voltage Vcc = –0.3 to 6.5 V
CNVss input voltage VI = –0.3 to Vcc +0.3 V
(2) The oscillation circuit constants of XIN-XOUT, XCIN-XCOUT may
be some differences between 3850 group (standard) and 3850
group (spec. A).
(3) Be sure to perform the termination of unused pins.
Handling of Source Pins
In order to avoid a latch-up occurrence, connect a capacitor suit-
able for high frequencies as bypass capacitor between power
source pin (VCC pin) and GND pin (VSS pin) and between power
source pin (VCC pin) and analog power source input pin (AVSS
pin). Besides, connect the capacitor to as close as possible. For
bypass capacitor which should not be located too far from the pins
to be connected, a ceramic capacitor of 0.01
F–0.1F is recom-
mended.
Power Source Voltage
When the power source voltage value of a microcomputer is less
than the value which is indicated as the recommended operating
conditions, the microcomputer does not operate normally and may
perform unstable operation.
In a system where the power source voltage drops slowly when
the power source voltage drops or the power supply is turned off,
reset a microcomputer when the power source voltage is less than
the recommended operating conditions and design a system not
to cause errors to the system by this unstable operation.
Flash Memory Version
Connect the CNVSS/VPP pin the shortest possible to the GND pat-
tern which is supplied to the Vss pin of the microcomputer. In
addition connecting an approximately 1 k to 5 k
resistor in series
to the GND could improve noise immunity. In this case as well as
the above mention, connect the pin the shortest possible to the
GND pattern which is supplied to the Vss pin of the microcom-
puter.
qReason
The CNVSS/VPP pin is the power source input pin for the built-in
flash memory. When programming in the flash memory, the im-
pedance of the VPP pin is low to allow the electric current for
writing to flow into the built-in flash memory. Because of this, noise
can enter easily. If noise enters the VPP pin, abnormal instruction
codes or data are read from the flash memory, which may cause a
program runaway.
Electric Characteristic Differences Between
Mask ROM and Flash Memory Version MCUs
There are differences in electric characteristics, operation margin,
noise immunity, and noise radiation between mask ROM and flash
memory version MCUs due to the differences in the manufacturing
processes.
When manufacturing an application system with the flash memory
and then switching to use of the mask ROM version, perform suffi-
cient evaluations for the commercial samples of the mask ROM
version.
CNVSS/(VPP)
VSS
The shortest
Approx. 5k
(Note)
Note. Shows the microcomputer's pin.
Fig. 67 Wiring for the CNVSS/VPP pin
DATA REQUIRED FOR MASK ORDERS
The following are necessary when ordering a mask ROM produc-
tion:
1. Mask ROM Order Confirmation Form
2. Mark Specification Form
3. Data to be written to ROM .................................. one floppy disk
For the mask ROM confirmation, refer to the “Renesas Technol-
ogy” Homepage Rom ordering (http://www.renesas.com/
homepage.jsp).
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