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參數(shù)資料
| 型號： | 90S8535 |
| 廠商： | Atmel Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
| 中文描述： | 位AVR微控制器具有8K字節(jié)的系統(tǒng)內可編程閃存 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大?。?/td> | 482K |
| 代理商： | 90S8535 |
AT90S/LS4434 and AT90S/LS8535
3
allows the program memory to be reprogrammed in-system
through an SPI serial interface or by a conventional nonvol-
atile memory programmer. By combining an 8-bit RISC
CPU with In-System Programmable Flash on a monolithic
chip, the Atmel AT90S4434/8535 is a powerful microcon-
troller that provides a highly flexible and cost effective solu-
tion to many embedded control applications.
The AT90S4434/8535 AVR is supported with a full suite of
program and system development tools including: C com-
pilers, macro assemblers, program debugger/simulators,
in-circuit emulators, and evaluation kits.
Comparison between AT90S4434 and AT90S8535
The AT90S4434 has 4K bytes of In-System Programmable
Flash, 256 bytes of EEPROM, and 256 bytes of internal
SRAM.
The AT90S8535 has 8K bytes of In-System Programmable
Flash, 512 bytes of EEPROM, and 512 bytes of internal
SRAM.
Table 1 summarizes the different memory sizes for the two
devices.
Pin Descriptions
VCC
Digital supply voltage
GND
Digital ground
Port A (PA7..PA0)
Port A is an 8-bit bi-directional I/O port. Port pins can pro-
vide internal pull-up resistors (selected for each bit). The
Port A output buffers can sink 20mA and can drive LED dis-
plays directly. When pins PA0 to PA7 are used as inputs
and are externally pulled low, they will source current if the
internal pull-up resistors are activated.
Port A also serves as the analog inputs to the A/D Con-
verter.
Port B (PB7..PB0)
Port B is an 8-bit bi-directional I/O pins 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
of the AT90S4434/8535 as listed on page 52.
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 alternatively be used as oscillator for
Timer/Counter2.
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 59.
RESET
Reset input. A low on this pin for two machine cycles while
the oscillator is running resets the device.
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 VCC via a low-pass filter.
See page 47 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.
Otherwise, connect to GND.
Crystal Oscillators
XTAL1 and XTAL2 are input and output, respectively, of an
inverting amplifier which can be configured for use as an
on-chip oscillator, as shown in Figure 1. Either a quartz
crystal or a ceramic resonator may be used. To drive the
device from an external clock source, XTAL2 should be left
unconnected while XTAL1 is driven as shown in Figure 2.
For the Timer Oscillator pins, PC6(OSC1) and PC7(OSC2),
the crystal is connected directly between the pins. No
external capacitors are needed. The oscillator is optimized
for use with a 32,768 Hz watch crystal. An external clock
signal applied to this pin goes through the same amplifier
having a bandwidth of 256 kHz. The external clock signal
should therefore be in the interval 0 Hz - 256 kHz.
Table 1.
Memory Size Summary
Part
Flash
EEPROM
SRAM
AT90S4434
4K bytes
256 bytes
256 bytes
AT90S8535
8K bytes
512 bytes
512 bytes
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