RL78/G10 CHAPTER 2 ELECTRICAL SPECIFICATIONS
R01DS0207EJ0100 Rev.1.00
Apr 15, 2013
Page 26 of 28
2.9 Timing of Entry to Flash Memory Programming Modes
Parameter Symbol Conditions MIN. TYP. MAX. Unit
How long from when an external
reset ends until the initial
communication settings are
specified
t
SUINIT
SPOR reset must end before the external
reset ends.
100 ms
How long from when the TOOL0
pin is placed at the low level until
an external reset ends
t
SU
SPOR reset must end before the external
reset ends.
10
μ
s
How long the TOOL0 pin must be
kept at the low level after an
external reset ends
t
HD
SPOR reset must end before the external
reset ends.
1 ms
RESET
TOOL0
<1>
<2>
<3>
t
SUINIT
t
HD
t
SU
<4>
Mode setting
one-byte data
<1> The low level is input to the TOOL0 pin.
<2> The external reset ends (SPOR reset must end before the external reset ends.).
<3> The TOOL0 pin is set to the high level.
<4> Setting of entry to the flash memory programming mode by UART reception.
Remark t
SUINIT: The segment shows that it is necessary to finish specifying the initial communication settings within 100
ms from when the resets end.
t
SU: How long from when the TOOL0 pin is placed at the low level until an external reset ends (MIN. 10
μ
s)
t
HD: How long to keep the TOOL0 pin at the low level from when the external reset ends
