When Pins Settle From The High-Impedance State At Power-On - Renesas H8S Series Hardware Manual

E.2

When Pins Settle from the High-Impedance State at Power-On

When the STBY pin level changes from low to high after powering on, the chip goes to the power-on reset state* after a
high level is detected at the STBY pin. While the chip detects a low level at the STBY pin, it is in the hardware standby
mode. During this interval, the pins are in the high-impedance state.
After detecting a high level at the STBY pin, the chip starts oscillation.
Note: * Excerpt for the H8S/2357 ZTAT, all resets are power-on resets, regardless of the level on the NMI pin.
Figure E-2 When Pins Settle from the High-Impedance State at Power-On
Rev.6.00 Oct.28.2004 page 1012 of 1016
REJ09B0138-0600H
V
CC
STBY
Hardware
standby mode
NMI
RES
φ
Notes: 1. Applies to the ZTAT version only.
2. Except for the H8S/2357 ZTAT, all resets are
power-on resets, regardless of the level on the NMI pin.
t
OSC1
Power-on reset*
T
1
Confirm t min and t
1
NMI = High
RES = Low
1
2
.*
NMIS