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HD6432351 bảng dữ liệu(PDF) 1017 Page - Renesas Technology Corp

tên linh kiện HD6432351
Giải thích chi tiết về linh kiện  16-Bit Single-Chip Microcomputer
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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Appendix E Pin States at Power-On
Rev. 3.00 Sep 15, 2006 page 983 of 988
REJ09B0330-0300
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 (tNMIS) 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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