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AT90S2323 Datasheet(PDF) 5 Page - ATMEL Corporation |
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AT90S2323 Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 64 page 5 AT90S/LS2323/2343 1004D–09/01 Pin Descriptions AT90S/LS2343 VCC Supply voltage pin. GND Ground pin. Port B (PB4..PB0) Port B is a 5-bit bi-directional I/O port with internal pull-up resistors. The Port B output buffers can sink 20 mA. As inputs, Port B pins that are externally pulled low, will source current if the pull-up resistors are activated. Port B also serves the functions of various special features. Port pins can provide internal pull-up resistors (selected for each bit). The Port B pins are tri-stated when a reset condition becomes active. RESET Reset input. An external reset is generated by a low level on the RESET pin. Reset pulses longer than 50 ns will generate a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset. CLOCK Clock signal input in external clock mode. Clock Options Crystal Oscillator The AT90S/LS2323 contains an inverting amplifier that can be configured for use as an On-chip oscillator, as shown in Figure 3. XTAL1 and XTAL2 are input and output respectively. Either a quartz crystal or a ceramic resonator may be used. It is recom- mended that the AT90S/LS2343 be used if an external clock source is used, since this gives an extra I/O pin. Figure 3. Oscillator Connection External Clock The AT90S/LS2343 can be clocked by an external clock signal, as shown in Figure 4, or by the On-chip RC oscillator. This RC oscillator runs at a nominal frequency of 1 MHz (V CC = 5V). A fuse bit (RCEN) in the Flash memory selects the On-chip RC oscillator as the clock source when programmed (“0”). The AT90S/LS2343 is shipped with this bit programmed. The AT90S/LS2343 is recommended if an external clock source is used, because this gives an extra I/O pin. The AT90S/LS2323 can be clocked by an external clock as well, as shown in Figure 4. No fuse bit selects the clock source for AT90S/LS2323. |
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