R5F104LED datasheet(124/213 Pages) RENESAS

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RL78/G14

2. ELECTRICAL SPECIFICATIONS (TA = -40 to +85

°C)

R01DS0053EJ0330 Rev. 3.30

Page 124 of 208

Aug 12, 2016

2.10

Timing of Entry to Flash Memory Programming Modes

<1> The low level is input to the TOOL0 pin.

<2> The external 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

tSUINIT: The segment shows that it is necessary to finish specifying the initial communication settings within 100 ms from

when the external resets end.

tSU:

How long from when the TOOL0 pin is placed at the low level until a pin reset ends

tHD:

How long to keep the TOOL0 pin at the low level from when the external resets end

(excluding the processing time of the firmware to control the flash memory)

(TA = -40 to +85°C, 1.8 V

≤ EVDD0 = EVDD1 ≤ VDD ≤ 5.5 V, VSS = EVSS0 = EVSS1 = 0 V)

Parameter

Symbol

Conditions

MIN.

TYP.

MAX.

Unit

How long from when an external reset ends until the

initial communication settings are specified

tSUINIT

POR and LVD reset must end

before the external reset ends.

100

How long from when the TOOL0 pin is placed at the

low level until an external reset ends

tSU

POR and LVD reset must end

before the external reset ends.

μs

How long the TOOL0 pin must be kept at the low

level after an external reset ends

(excluding the processing time of the firmware to

control the flash memory)

tHD

POR and LVD reset must end

before the external reset ends.

1ms

RESET

TOOL0

<1>

<2>

<3>

tSU

<4>

tSUINIT

723 µs + tHD

processing

time

00H reception

(TOOLRxD, TOOLTxD mode)

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