Rev. 4708C–4BMCU–02/04
Features/Benefits
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 g180 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
– 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
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.
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
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
2 K x 8 bit
VMI
with modulator
SSI
External
clock input
interval- and
8/12-bit timer
T2I
V
SS
Low-current
Microcontroller
for Watchdog
Function
ATA6020N