HOKUTO DENSHI
CO;LTD;
FLASH2
株式会社
17
Timing chart of boot mode control
<<At Start>>
RESET
(Open collector
）
FWE
・
MD0
・
MD1
I/O0
・
I/O1
・
I/O2
To RXD port
（
Data transferred
）
*1 From the 17
th
line of the interface transfer of "00" is repeated within the 512
times limit until reply from the target. When nothing reply from the target MCU
at the 15
th
line of the interface, the job is canceled as an error.
<<At Ending>>
RESET
（
Open collector
）
FWE
・
MD0
・
MD1
I/O0
・
I/O1
・
I/O2
To RXD port
（
Data transferred
）
For the target board clock, 0.16% or less is recommended as the serial communication error rate. Refer to the table of the
bit-rate-register in the chapter of
“Serial Communications” of Renesas Electronics hardware manual for the concerned
MCU. If this error rate is more than above recommended 0.16%, the rate can
’t be raised at the target program transfer.
FLASH2 can control the target MCU into boot mode in programming procedure. For this automatic control function, the
user
’s interface must be organized for the connections to MCU ports that specified in Renesas Electronics hardware
manual for the concerned MCU. In the reference circuit diagrams in our
“the User’s Guide” we inform the connections
including this function. Be careful about the interface signal names are named in convenient for the parameter setting.
These terminal state select box can be used with the user
’s own idea, “MD0”, “MD1”, “I/O0”, “I/O1”, “I/O2” can be set at
three levels of Low, High and High-Z,
“FWE” can be set at two levels of Low and High; these terminal state can be set and
remain in the memory corresponding to the MCU type. FLASH2 can progress the procedure, if these Mode control
function does not work with their disconnections. Select
“High-Z”, when the mode control is arranged with the target board
switches.
These escriptions are
outline, refer to the
Renesas
Electronics
hardware manual in
detail.
MCU clock displayed
in operation of writing
is the estimated value
from transfer rate etc.
This value may differ
from the real value.
About 500msec
About 1000 msec
About 1000 msec
*1 Transfer of "00"
H
H
H
H
・
L
・
Hi-Z
L
Hi-Z
H
Hi-Z
1
st
3
rd
5
th
7
th
9
th
11
th
13
th
17
th
About 500msec
About 500msec
H
Hi-Z
Hi-Z
L
H
1
st
3
rd
5
th
7
th
9
th
11
th
13
th
1
7
th