Rev. 4535C–4BMCU–02/04
Low-current
Microcontroller
for Wireless
Communication
ATAR092
ATAR892
Features
4-Kbyte ROM, 256 × 4-bit RAM
16 Bidirectional I/Os
Up to 7 External/Internal Interrupt Sources
Multifunction Timer/Counter with
– IR Remote Control Carrier Generator
– Bi-phase-, Manchester- and Pulse-width Modulator and Demodulator
– Phase Control Function
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 (ATAR892 only)
Synchronous Serial Interface (2-wire, 3-wire)
Watchdog, POR and Brown-out Function
Voltage Monitoring Inclusive Lo_BAT Detect
Flash Controller ATAM893 Available (SSO20)
Description
The ATAR092 and ATAR892 are members of Atmel’s family of 4-bit single-chip micro-
controllers. They offer highest integration for IR and RF data communication, remote-
control and phase-control applications. The ATAR092 and ATAR892 are suitable for
the transmitter side as well as the receiver 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 external clock input, integrated RC-,
32-kHz crystal- and 4-MHz crystal-oscillators. The ATAR892 has an additional
EEPROM as a second chip in one package.
Figure 1. Block Diagram
V
DD
T2I SD
Voltage monitor
External input
MARC4
UTCM
OSC1 OSC2
I/O bus
ROM RAM
4-bit CPU core
256 x 4 bit
V
SS
Data direction +
alternate function
Data direction +
interrupt control
Port 4 Port 5
Data direction +
alternate function
Port 6
Timer 3
Brown-out protect.
RESET
Clock management
Timer 1
watchdog timer
Timer 2
Serial interface
Port 1
P
o
r
t

2
D
a
t
a

d
i
r
e
c
t
i
o
n
T2O
SD
SC
T3O
T3I
BP10
BP13
BP20/NTE
BP21
BP22
BP23
BP40
INT3
SC
BP41
VMI
BP42
T2O
BP43
INT3
BP50
INT6
BP51
INT6
BP52
INT1
BP53
INT1
BP60
T3O
BP63
T3I
RC
oscillators
Crystal
oscillators
4 K x 8 bit
VMI
with modulator
SSI
External
clock input
interval- and
8/12-bit timer
8-bit
timer/counter
with modulator
and demodulator
T2I