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参数资料
| 型号： | M38D5XGXFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件页数： | 138/142页 |
| 文件大小： | 2004K |
| 代理商： | M38D5XGXFP |
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Rev.3.04
May 20, 2008
Page 95 of 134
REJ03B0158-0304
38D5 Group
NOTES ON FLASH MEMORY VERSION
CPU Rewrite Mode
(1) Operation speed
During CPU rewrite mode, set the system clock
φ 4.0 MHz or
less using the main clock division ratio selection bits (bits 6 and
7 of address 003B16).
(2) Instructions inhibited against use
The instructions which refer to the internal data of the flash
memory cannot be used during the CPU rewrite mode.
(3) Interrupts inhibited against use
The interrupts cannot be used during the CPU rewrite mode
because they refer to the internal data of the flash memory.
(4) Watchdog timer
In case of the watchdog timer has been running already, the
internal reset generated by watchdog timer underflow does not
happen, because of watchdog timer is always clearing during
program or erase operation.
(5) Reset
Reset is always valid. In case of CNVSS = “H” when reset is
released, boot mode is active. So the program starts from the
address contained in address FFFC16 and FFFD16 in boot ROM
area.
CNVSS Pin
The CNVSS pin determines the flash memory mode.
Connect the CNVSS/VPP pin the shortest possible to the GND
pattern which is supplied to the VSS pin of the microcomputer.
In addition connecting an approximately 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 V SS pin o f the
microcomputer.
Note. When the boot mode or the standard serial I/O mode is used, a
switch of the input level to the CNVSS pin is required.
Fig 90. Wiring for the CNVSS
NOTES ON DIFFERENCES BETWEEN QzROM
VERSION AND FLASH MEMORY VERSION
The QzROM and flash memory versions differ in their
manufacturing processes, built-in ROM, and layout patterns.
Because of these differences, characteristic values, operation
margins, noise immunity, and noise radiation and oscillation
circuit constants may vary within the specified range of electrical
characteristics.
When switching to the QzROM version, implement system
evaluations equivalent to those performed in the flash memory
version.
Confirm page 11 about the differences of functions.
The shortest
CNVSS
VSS
Approx. 5k
The shortest
(1)
Note 1: Shows the microcomputer’s pin.
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| M38DC-15 | 制造商:M/A-COM Technology Solutions 功能描述:MIXER(SPEC UX1015) - Bulk |
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