Features/Benefits
• Very Low Power Consumption in Active, Power-down and Sleep Mode
2-Kbyte ROM, 256 × 4-bit RAM
12 Bi-directional I/Os
Up to 6 External/Internal Interrupt Sources
Multifunction Timer/Counter
Programmable System-clock with Prescaler and Five Different Clock Sources
Wide Supply-voltage Range (1.8 V to 6.5 V)
Very Low Sleep Current (< 1 µA)
Synchronous Serial Interface (2-wire, 3-wire)
Watchdog, POR and Brown-out Function
Voltage Monitoring Inclusive Lo_BAT Detection
Flash Controller ATAM893 available (SSO20)
Description
The ATAR080 is a member of Atmel’s family of 4-bit single-chip microcontrollers. It
contains ROM, RAM, parallel I/O ports, one 8-bit programmable multifunction
timer/counter with modulator function, voltage supervision, interval timer with watch-
dog function and a sophisticated on-chip clock generation with external clock input,
integrated RC-, 32-kHz and 4-MHz crystal-oscillators.
Figure 1. Block Diagram
Voltage Monitor
External input
MARC4
4-bit CPU core
UTCM
OSC1
NRST/
OSC2
I/O bus
ROM
2 K × 8 bit
RAM
256 × 4 bit
VSS
Data direction +
alternate function
Port 4 Port 5
Clock management
Timer 1
interval- and
watchdog timer
Timer 2
8/12-bit timer
with modulator
P
o
r
t

2
D
a
t
a

d
i
r
e
c
t
i
o
n
T2O
SD
SC
BP20/NTE
BP21
BP22
BP23
BP40
INT3
SC
BP41
VMI
T2I
BP43
INT3
SD
BP42
T2O
RC
oscillators
VMI
T2I
VDD
Brown-out
protect RESET
Crystal
oscillators
External
clock input
Data direction +
interrupt control
SSI
Serial interface
BP50
INT6
BP51
INT6
BP52
INT1
BP53
INT1
Low-current
Microcontroller
for Wireless
Communication
ATAR080
Rev. 4675D–4BMCU–12/04