Rev. 4696C–4BMCU–02/04
Features
2-Kbyte ROM, 256 × 4-bit RAM
12 Bi-directional I/Os
Up to 6 External/Internal Interrupt Sources
Multifunction Timer/Counter with
– IR Remote Control Carrier Generator
– Bi-phase-, Manchester- and Pulse-width Modulator and Demodulator
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)
32 × 16-bit EEPROM (ATAR890 only)
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 ATAR090 and ATAR890 are members of Atmel’s family of 4-bit single-chip micro-
controllers. They offer the highest integration for IR and RF data communication and
remote-control. The ATAR090 and ATAR890 are suitable for the transmitter side. They
contain ROM, RAM, parallel I/O ports, two 8-bit programmable multifunction
timer/counters with modulator and demodulator function, voltage supervisor, interval
timer with watchdog function and a sophisticated on-chip clock generation with exter-
nal clock input, integrated RC-, 32-kHz crystal- and 4-MHz crystal-oscillators. The
ATAR890 has an additional EEPROM as a second chip in one package.
Figure 1. Block Diagram
Voltage monitor
External input
MARC4
UTCM
OSC1
I/O bus
ROM RAM
4-bit CPU core
256 x 4 bit
V
DD
V
SS
Data direction +
alternate function
Data direction +
interrupt control
Port 4 Port 5
Brown-out protect
RESET
Clock management
Timer 1
watchdog timer
Timer 2
Serial interface
Por
t
2
Data di
r
e
c
t
i
o
n
T2O
SD
SC
BP20/NTE
BP21
BP22
BP23
BP40
INT3
SC
BP41
VMI
T2I
BP42
T2O
BP43
INT3
SD
BP50
INT6
BP51
INT6
BP52
INT1
BP53
INT1
RC
oscillators
Crystal
oscillators
2 K x 8 bit
VMI
with modulator
SSI
External
clock input
interval- and
8/12-bit timer
T2I
OSC2
Low-current
Microcontroller
for Wireless
Communication
ATAR090
ATAR890