Rev.6.00 Oct.28.2004 page 1012
of 1016
REJ09B0138-0600H
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.
V
CC
NMI
φ
Power-on reset
*
1
t
OSC1
NMI = High
RES = Low
T
1
Confirm t
1
min and t
NMIS
.
*
2
Hardware
standby mode
STBY
RES
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.
Figure E-2 When Pins Settle from the High-Impedance State at Power-On
Summary of Contents for ZTAT H8S/2357F
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