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SC68C652B bảng dữ liệu(PDF) 7 Page - NXP Semiconductors

tên linh kiện SC68C652B
Giải thích chi tiết về linh kiện  5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.) with 32-byte FIFOs, IrDA encoder/decoder, and 68 mode mP interface
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nhà sản xuất  NXP [NXP Semiconductors]
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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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