ATAR890_14 Datasheet, PDF (1/75 Pages) ATMEL Corporation – Multifunction Timer/Counter with

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
V_SS V_DD
OSC1 OSC2
Low-current
Microcontroller
for Wireless
Communication
ATAR090
ATAR890
BP20/NTE
BP21
BP22
BP23
Brown-out protect
RESET
Voltage monitor
External input
VMI
RC
Crystal
External
oscillators oscillators clock input
Clock management
ROM
RAM
2 K x 8 bit 256 x 4 bit
MARC4
4-bit CPU core
I/O bus
UTCM
Timer 1
interval- and
watchdog timer
Timer 2
8/12-bit timer
with modulator
SSI
Serial interface
T2I
T2O
SD
SC
Data direction +
alternate function
Port 4
Data direction +
interrupt control
Port 5
BP40 BP42
INT3
T2O
SC _BP41
BP43
VMI
INT3
T2I
SD
BP50
INT6
BP52
INT1
BP51
INT6
BP53
INT1
Rev. 4696D–4BMCU–12/04