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Atmel Electronic Components Datasheet

90S4414 Datasheet

8-Bit Microcontroller with 4K bytes In-System Programmable Flash

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90S4414 pdf
Features
AVR® - High Performance and Low Power RISC Architecture
118 Powerful Instructions - Most Single Clock Cycle Execution
4K bytes of In-System Reprogrammable Flash
– SPI Serial Interface for Program Downloading
– Endurance: 1,000 Write/Erase Cycles
256 bytes EEPROM
– Endurance: 100,000 Write/Erase Cycles
256 bytes Internal SRAM
32 x 8 General Purpose Working Registers
32 Programmable I/O Lines
Programmable Serial UART
SPI Serial Interface
VCC: 2.7 - 6.0V
Fully Static Operation
– 0 - 8 MHz, 4.0 - 6.0V
– 0 - 4 MHz, 2.7 - 4.0V
Up to 8 MIPS Throughput at 8 MHz
One 8-Bit Timer/Counter with Separate Prescaler
One 16-Bit Timer/Counter with Separate Prescaler
and Compare and Capture Modes
Dual PWM
External and Internal Interrupt Sources
Programmable Watchdog Timer with On-Chip Oscillator
On-Chip Analog Comparator
Low Power Idle and Power Down Modes
Programming Lock for Software Security
Description
The AT90S4414 is a low-power CMOS 8-bit microcontroller based on the AVR
enhanced RISC architecture. By executing powerful instructions in a single clock
cycle, the AT90S4414 achieves throughputs approaching 1 MIPS per MHz allowing
the system designer to optimize power consumption versus processing speed.
The AVR core is based on an enhanced RISC architecture that combines a rich
instruction set with 32 general purpose working registers. All the 32 registers are
directly connected to the Arithmetic Logic Unit (ALU), allowing two independent regis-
ters to be accessed in one single instruction executed in one clock cycle. The resulting
architecture is more code efficient while achieving throughputs up to ten times faster
than conventional CISC microcontrollers.
(continued)
8-Bit
Microcontroller
with 4K bytes
In-System
Programmable
Flash
AT90S4414
Preliminary
Pin Configurations
Rev. 0840DS–07/98
Note: This is a summary document. For the complete 76 page
datasheet, please visit
mail at literature@atme
our
l.co
web s
m and
ite at w
request
ww.atmel.com or e1-
literature #0840D.



Atmel Electronic Components Datasheet

90S4414 Datasheet

8-Bit Microcontroller with 4K bytes In-System Programmable Flash

No Preview Available !

90S4414 pdf
Block Diagram
Figure 1. The AT90S4414 Block Diagram
The AT90S4414 provides the following features: 4K bytes
of In-System Programmable Flash, 256 bytes EEPROM,
256 bytes SRAM, 32 general purpose I/O lines, 32 general
purpose working registers, flexible timer/counters with
compare modes, internal and external interrupts, a pro-
grammable serial UART, programmable Watchdog Timer
with internal oscillator, an SPI serial port and two software
selectable power saving modes. The Idle Mode stops the
CPU while allowing the SRAM, timer/counters, SPI port
and interrupt system to continue functioning. The power
down mode saves the register contents but freezes the
oscillator, disabling all other chip functions until the next
interrupt or hardware reset.
The device is manufactured using Atmel’s high density
non-volatile memory technology. The on-chip In-System
Programmable Flash allows the program memory to be
reprogrammed in-system through an SPI serial interface or
by a conventional nonvolatile memory programmer. By
combining an enhanced RISC 8-bit CPU with In-System
Programmable Flash on a monolithic chip, the Atmel
AT90S4414 is a powerful microcontroller that provides a
highly flexible and cost effective solution to many embed-
ded control applications.
The AT90S4414 AVR is supported with a full suite of pro-
gram and system development tools including: C compil-
ers, macro assemblers, program debugger/simulators, in-
circuit emulators, and evaluation kits.
2 AT90S4414



Atmel Electronic Components Datasheet

90S4414 Datasheet

8-Bit Microcontroller with 4K bytes In-System Programmable Flash

No Preview Available !

90S4414 pdf
AT90S4414
Pin Descriptions
VCC
Supply voltage
GND
Ground
Port A (PA7..PA0)
Port A is an 8-bit bidirectional 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 serves as Multiplexed Address/Data input/output
when using external SRAM.
Port B (PB7..PB0)
Port B is an 8-bit bidirectional 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 AT90S4414 as listed on page 45.
Port C (PC7..PC0)
Port C is an 8-bit bidirectional I/O port with internal pull-up
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.
Port C also serves as Address output when using external
SRAM.
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 AT90S4414 as listed on page 51.
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
ICP
ICP is the input pin for the Timer/Counter1 Input Capture
function.
OC1B
OC1B is the output pin for the Timer/Counter1 Output
CompareB function
ALE
ALE is the Address Latch Enable used when the External
Memory is enabled. The ALE strobe is used to latch the
low-order address (8 bits) into an address latch during the
first access cycle, and the AD0-7 pins are used for data
during the second access cycle.
Crystal Oscillator
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 2. 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 3.
Figure 2. Oscillator Connections
Figure 3. External Clock Drive Configuration
3




Part Number 90S4414
Description 8-Bit Microcontroller with 4K bytes In-System Programmable Flash
Maker ATMEL Corporation
Total Page 10 Pages
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