參數(shù)資料
型號: 38D5
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機(jī)
文件頁數(shù): 134/141頁
文件大?。?/td> 2027K
代理商: 38D5
Rev.3.01
REJ03B0158-0301
Aug 08, 2007
Page 134 of 134
38D5 Group
Notes on Flash Memory Version
CPU Rewrite Mode
1. Operating 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 003B
16
).
2. Prohibited Instructions
The instructions which refer to the internal data of the flash
memory cannot be used during the CPU rewrite mode.
3. Interrupts
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 CNV
SS
= “H” when reset is
released, boot mode is active. So the program starts from the
address contained in address FFFC
16
and FFFD
16
in boot ROM
area.
CNV
SS
Pin
The CNV
SS
pin determines the flash memory mode.
Connect the CNV
SS
pin the shortest possible to the GND pattern
which is supplied to the V
SS
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 of the
microcomputer.
Note. When the boot mode or the standard serial I/O mode is used, a
switch of the input level to the CNV
SS
pin is required.
Fig. 110 Wiring for CNV
SS
pin
The shortest
CNV
SS
V
SS
Approx. 5k
The shortest
(1)
(1)
Note 1: Shows the microcomputer’s pin.
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