Features/Benefits
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Programmable System Clock with Prescaler and Three Different Clock Sources
Very Low Sleep Current (< 1 µA)
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
Synchronous Serial Interface (2-wire, 3-wire)
Multifunction Timer/Counter with
Low-current
Microcontroller
for Watchdog
Function
– Watchdog, POR and Brown-out Function
– Voltage Monitoring Inclusive Lo_BAT Detection
– Flash Controller ATAM893 Available (SSO20)
– Code-efficient Instruction Set
– High-level Language Programming with qFORTH Compiler
1. Description
The ATA6020N is a member of Atmel’s 4-bit single-chip microcontroller family. It con-
tains ROM, RAM, parallel I/O ports, one 8-bit programmable multifunction
timer/counter with modulator function, voltage supervisor, interval timer with watchdog
function and a sophisticated on-chip clock generation with external clock input and
integrated RC-oscillators.
ATA6020N
Figure 1-1. Block Diagram
VDD
VSS
OSC1
Brown-out protect
RESET
RC
oscillators
External
clock input
Voltage monitor
External input
UTCM
Clock management
Timer 1
interval- and
watchdog timer
VMI
ROM
2 K x 8 bit
RAM
256 x 4 bit
T2I
Timer 2
8/12-bit timer
T2O
with modulator
SD
SC
MARC4
BP20/NTE
BP21
SSI
4-bit CPU core
Serial interface
BP22
I/O bus
BP23
Data direction +
alternate function
Data direction +
interrupt control
Port 4
Port 5
BP50
INT6
BP52
INT1
BP40
BP42
T2O
INT3
SC
BP51 BP53
INT6 INT1
BP41
VMI
T2I
BP43
INT3
SD
Rev. 4708D–4BMCU–09/05