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EM6819 Datasheet(PDF) 77 Page - EM Microelectronic - MARIN SA |
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EM6819 Datasheet(HTML) 77 Page - EM Microelectronic - MARIN SA |
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77 / 154 page  R EM6819 Copyright © 2009, EM Microelectronic-Marin SA 07 /09 – rev.D 77 www.emmicroelectronic.com Figure 13; Port B IO configuration • For maximum flexibility all Port B configuration bits are are fully user configurable. • The pull resistors are only active if the pad driver is not driving the pad terminal, and pullup or pulldown resistors are enabled. Pullup has priority over pulldown. • The CPU read of the port B terminal logic value (PB[n]) in register RegPBDIn is depending of the PBInpEn blocking bit. As such one reads ‘0’ if PBInpEn=’0’ (Input blocked) and the terminal logic value if PBInpEn=’1’. • At power-up, the PB[n] terminals are tristate with pullup and pulldown resistors disconnected and the input is disabled. As such all PB terminal can float without the penalty of additional power consumption. Note: Make sure to setup the terminal correctly before using it.. 15.2.1 GASP COMMUNICATION ON PB7, PB6 As soon as TM terminal becomes high the terminal PB7 and PB6 configurations are forced by the Gasp module without altering the port B register settings. Gasp mode has priority over normal IO mode on these 2 terminals. |
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