Renesas rl78 User Manual
RL78/G1A
CHAPTER 29 ELECTRICAL SPECIFICATIONS (T
A
=
−40 to +85°C)
R01UH0305EJ0200 Rev.2.00
905
Jul 04, 2013
29.10 Timing Specs for Switching Flash Memory Programming Modes
(T
A
=
−40 to +85°C, 1.8 V ≤ EV
DD0
≤ V
DD
≤ 3.6 V, V
SS
= EV
SS0
= 0 V)
Parameter Symbol Conditions MIN.
TYP.
MAX.
Unit
How long from when an external reset
ends until the initial communication
settings are specified
t
SUINIT
POR and LVD reset must end before the
external reset ends.
100
ms
How long from when the TOOL0 pin is
placed at the low level until a external
reset ends
t
SU
POR and LVD reset must end before the
external reset ends.
10
μs
How long the TOOL0 pin must be kept at
the low level after an external reset ends
(except flash firmware processing time)
t
HD
POR and LVD reset must end before the
external reset ends.
1 ms
RESET
TOOL0
<1>
<2>
<3>
t
SUINIT
00H reception
(TOOLRxD, TOOLTxD mode)
t
SU
<4>
723
μs + t
HD
process time
<1> The low level is input to the TOOL0 pin.
<2> The pins reset ends (POR and LVD reset must end before the external reset ends.).
<3> The TOOL0 pin is set to the high level.
<4> Setting of the flash memory programming mode by UART reception and complete the baud
rate setting.
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 a external reset ends
t
HD
:
How long to keep the TOOL0 pin at the low level from when the external resets end (except flash
firmware processing time)
<R>
<R>
<R>