H8SSLASH2214 datasheet(418/936 Pages) RENESAS

部件名	H8S/2214

功能描述	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	936 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

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418 / 936 page

Section 9 I/O Ports

Rev.4.00 Sep. 18, 2008 Page 358 of 872

REJ09B0189-0400

9.14

Handling of Unused Pins

Unused input pins must be held at either the high level or the low level.

Input pins in CMOS devices are usually high-impedance inputs. If an unused pin is operated in the

open state, it is possible that intermediate levels could be generated by induction from peripheral

noise, and through currents could occur internally. This could lead to incorrect operation. Unused

input pins must be handled as listed in table 9.26

Table 9.26

Handling of Unused Input Pins

Pin Name

Pin Handling Example

Port 1

Connect each pin, through a resistor, to either VCC (pull up) or to VSS (pull down).

Port 3

Port 4

Port 7

Port 9

Connect each pin, through a resistor, to either AVCC (pull up) or to AVSS (pull down).

Port A

Connect each pin, through a resistor, to either VCC (pull up) or to VSS (pull down).

Port B

Port C

Port D

Port E

Port F

Port G

H8S/2214 数据表(PDF) 418 Page - Renesas Technology Corp