H8SXSLASH1663R datasheet(134/1504 Pages) RENESAS

tên linh kiện	H8SX/1663R

Giải thích chi tiết về linh kiện	Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series

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Section 4 Resets

Rev. 2.00 Sep. 24, 2008 Page 102 of 1468

REJ09B0412-0200

Vpor

External

power supply Vcc

Vcc

RES pin

POR signal

("L" is valid)

Reset signal

("L" is valid)

Pin reset and

OR signal for POR

PORF

Reset state

tPOR*2

Set

Notes: For details of the electrical characteristics, see section 30, Electrical Characteristics.

1. V

POR shows a level of power-on reset detection level.

2. T

POR shows a time for power-on reset.

Figure 4.2 Operation of a Power on Reset

4.6

Power Supply Monitoring Reset (H8SX/1668M Group)

This is an internal reset generated by the power-supply detection circuit.

When Vcc falls below Vdet in the state where the LVDE bit in LVDCR has been set to 1 and the

LVDRI bit has been cleared to 0, a voltage-monitoring reset is generated. When Vcc subsequently

rises above Vdet, release from the voltage-monitoring reset proceeds after a specified time has

elapsed.

For details of the voltage-monitoring reset, see section 5, Voltage Detection Circuit (LVD), and

section 30, Electrical Characteristics.

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