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| 型號(hào)： | AT90SC6404R |
| 英文描述： | AT90SC6404R Preliminary Summary [Updated 1/03. 4 Pages] |
| 中文描述： | AT90SC6404R初步摘要[更新1 / 03。 4頁] |
| 文件頁數(shù)： | 4/13頁 |
| 文件大?。?/td> | 641K |
| 代理商： | AT90SC6404R |
AT90S/LS4434 and AT90S/LS8535
4
The Port B pins are tristated when a reset condition becomes active, even if the clock is not running.
Port C (PC7..PC0)
Port C is an 8-bit bi-directional I/O port with internal pullup resistors. The Port C output buffers can sink 20 mA. As inputs,
Port C pins that are externally pulled low will source current if the pull-up resistors are activated. Two Port C pins can alter-
natively be used as oscillator for Timer/Counter2.
The port C pins are tristated when a reset condition becomes active, even if the clock is not running.
Port D (PD7..PD0)
Port D is an 8-bit bidirectional I/O port with internal pull-up resistors. The Port D output buffers can sink 20 mA. As inputs,
Port D pins that are externally pulled low will source current if the pull-up resistors are activated.
Port D also serves the functions of various special features of the AT90S4434/8535 as listed on page 76.
The port D pins are tristated when a reset condition becomes active, even if the clock is not running.
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.
XTAL1
Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
XTAL2
Output from the inverting oscillator amplifier
AVCC
This is the supply voltage pin for the A/D Converter. It should be externally connected to V
CC
via a low-pass filter. See
page 59 for details on operation of the ADC.
AREF
This is the analog reference input for the A/D Converter. For ADC operations, a voltage in the range AGND to AV
CC
must
be applied to this pin.
AGND
Analog ground. If the board has a separate analog ground plane, this pin should be connected to this ground plane. Other-
wise, connect to GND.
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