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H8S2245 데이터시트(PDF) 809 Page - Renesas Technology Corp

부품명 H8S2245
상세설명  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
PDF  818 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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Appendix E Pin States at Power-On
Rev.3.00 Mar. 26, 2007 Page 767 of 772
REJ09B0355-0300
Appendix E Pin States at Power-On
Note that pin states at power-on depend on the state of the
STBY pin and NMI pin. The case in
which pins settle* from an indeterminate state at power-on, and the case in which pins settle* from
the high-impedance state, are described below.
After reset release, power-on reset exception handling is started.
Note: *
"Settle" refers to the pin states in a power-on reset in each MCU operating mode.
E.1
When Pins Settle from an Indeterminate State at Power-On
When the NMI 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 NMI pin. While the chip detects a low level at the
NMI pin, the manual reset state is established. The pin states are indeterminate during this
interval. (Ports may output an internally determined value after powering on.)
The NMI setup time (t
NMIS) is necessary for the chip to detect a high level at the NMI pin.
VCC
STBY
NMI
RES
φ
Power-on reset
tOSC1
NMI = Low
→ NMI = High
RES = Low
Manual reset
Figure E.1 When Pins Settle from an Indeterminate State at Power-On



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