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P87LPC779FDH bảng dữ liệu(PDF) 31 Page - NXP Semiconductors |
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P87LPC779FDH bảng dữ liệu(HTML) 31 Page - NXP Semiconductors |
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31 / 74 page  Philips Semiconductors P87LPC779 CMOS single-chip 8-bit microcontroller Product data Rev. 02 — 03 May 2004 31 of 74 9397 750 13213 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 8.9.3 Push-pull output configuration The push-pull output configuration has the same pulldown 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. The push-pull port configuration is shown in Figure 12. The three port pins that cannot be configured are P1.2, P1.3, and P1.5. The port pins P1.2 and P1.3 are permanently configured as open drain outputs. They may be used as inputs by writing ones to their respective port latches. P1.5 may be used as a Schmitt trigger input if the P87LPC779 has been configured for an internal reset and is not using the external reset input function RST. Additionally, port pins P2.0 and P2.1 are disabled for both input and output if one of the crystal oscillator options is chosen. Those options are described in Section 8.10 “Oscillator” on page 34. Fig 11. Open drain output. 002aaa629 port latch data input data N port pin Fig 12. Push-pull output. 002aaa630 port latch data input data N port pin P VDD |
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