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P89LPC916 Datasheet(PDF) 39 Page - NXP Semiconductors |
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P89LPC916 Datasheet(HTML) 39 Page - NXP Semiconductors |
39 / 72 page Philips Semiconductors P89LPC915/916/917 8-bit microcontrollers with accelerated two-clock 80C51 core Product data Rev. 04 — 17 December 2004 39 of 72 9397 750 14397 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. pin is driven LOW, it is driven strongly and able to sink a fairly large current. These features are somewhat similar to an open-drain output except that there are three pull-up transistors in the quasi-bidirectional output that serve different purposes. The P89LPC915/916/917 is a 3 V device, but the pins are 5 V-tolerant. In quasi-bidirectional mode, if a user applies 5 V on the pin, there will be a current flowing from the pin to VDD, causing extra power consumption. Therefore, applying 5 V in quasi-bidirectional mode is discouraged. A quasi-bidirectional port pin has a Schmitt triggered input that also has a glitch suppression circuit. 9.12.3 Open-drain output configuration The open-drain output configuration turns off all pull-ups and only drives the pull-down transistor of the port driver when the port latch contains a logic 0. To be used as a logic output, a port configured in this manner must have an external pull-up, typically a resistor tied to VDD. An open-drain port pin has a Schmitt triggered input that also has a glitch suppression circuit. 9.12.4 Input-only configuration The input-only port configuration has no output drivers. It is a Schmitt triggered input that also has a glitch suppression circuit. 9.12.5 Push-pull output configuration The push-pull output configuration has the same pull-down structure as both the open-drain and the quasi-bidirectional output modes, but provides a continuous strong pull-up when the port latch contains a logic 1. The push-pull mode may be used when more source current is needed from a port output. A push-pull port pin has a Schmitt triggered input that also has a glitch suppression circuit. 9.12.6 Port 0 analog functions The P89LPC915/916/917 incorporates two Analog Comparators. In order to give the best analog function performance and to minimize power consumption, pins that are being used for analog functions must have the digital outputs and digital inputs disabled. Digital outputs are disabled by putting the port output into the Input-Only (high impedance) mode as described in Section 9.12.4 “Input-only configuration”. Digital inputs on Port 0 may be disabled through the use of the PT0AD register. On any reset, the PT0AD bits default to logic 0s to enable digital functions. |
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