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參數(shù)資料
| 型號： | AT90L2323-4SI |
| 英文描述： | Microcontroller |
| 中文描述： | 微控制器 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 286K |
| 代理商： | AT90L2323-4SI |
5
AT90S2323/LS2323 and AT90S2343/LS2343
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 recommended 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.
相關PDF資料 |
PDF描述 |
|---|---|
| AT90L2343-4PC | Microcontroller |
| AT90L2343-4PI | Microcontroller |
| AT90L2343-4SC | Microcontroller |
| AT90L2343-4SI | Microcontroller |
| AT90L4433 | AT90S/L4433 Complete [Updated 4/03. 126 Pages] |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AT90L2343-4PC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| AT90L2343-4PI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| AT90L2343-4SC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| AT90L2343-4SI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| AT90L4433 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AT90S/L4433 Complete [Updated 4/03. 126 Pages] |
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