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SC68C652B датащи(PDF) 7 Page - NXP Semiconductors |
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SC68C652B датащи(HTML) 7 Page - NXP Semiconductors |
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7 / 43 page ![]() SC68C652B_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 2 November 2009 7 of 43 NXP Semiconductors SC68C652B Dual UART with 32-byte FIFOs and IrDA encoder/decoder VCC 19, 42 I Power supply input. XTAL1 13 I Crystal or external clock input. Functions as a crystal input or as an external clock input. A crystal can be connected between this pin and XTAL2 to form an internal oscillator circuit (see Figure 3). This configuration requires an external 1 M Ω resistor between the XTAL1 and XTAL2 pins. Alternatively, an external clock can be connected to this pin to provide custom data rates. See Section 6.8 “Programmable baud rate generator”. XTAL2 14 O Output of the crystal oscillator or buffered clock. (See also XTAL1.) XTAL2 is used as a crystal oscillator output or a buffered clock output. Should be left open if an external clock is connected to XTAL1. For extended frequency operation, this pin should be tied to VCC via a 2 kΩ resistor. Table 2. Pin description …continued Symbol Pin Type Description |
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