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ATAM894 Datasheet, PDF (1/97 Pages) ATMEL Corporation – 8k-flash Microcontroller | |||
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Features
⢠8 K à 8-bit EEPROM
⢠EEPROM Programmable Options
⢠Read Protection for the EEPROM Program Memory
⢠256 à 4-bit RAM
⢠2 à 32 à 16-bit Data EEPROM
⢠Up to Seven External/Internal Interrupt Sources
⢠Eight Hardware and Software Interrupt Priorities
⢠16 Bi-directional I/Os
⢠Wide Supply-voltage Range (1.8V to 6.5V)
⢠Very Low Sleep Current (< 1 µA)
⢠Synchronous Serial Interface (2-wire, 3-wire)
⢠Multifunction Timer/Counter with Prescaler/Interval Timer
⢠Voltage Monitoring Inclusive Lo_BAT Detect
⢠Watchdog, POR and Brown-out Function
8k-flash
Microcontroller
ATAM894
1. Description
The ATAM894 is a member of the Atmelâs family of 4-bit single chip microcontrollers
with 8K Ã 8-bit EEPROM program memory. It is based on the 4-K MTP version
ATAM893 and fully compatible with this MTP and the ROM versions ATAR090/890
and ATAR092/892.
Figure 1-1.
Block Diagram
VSS VDD
OSC1 OSC2
BP10
BP13
BP20/NTE
BP21
BP22
BP23
Brown-out protect.
RESET
Voltage monitor
External input
VMI
Port 1
RC
Crystal
External
oscillators oscillators clock input
Clock management
EEPROM RAM
8 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
T2I
with prescaler
T2O
Modulator 2
SD
SSI
SC
Serial interface
Modulator 3 T3O
Demodulator
Timer 3
T3I
timer/counter
Data direction +
alternate function
Port 4
Data direction +
interrupt control
Port 5
Data dir. +
alt. function
Port 6
EEPROM SD
2 x 32 x 16 bit SC
BP40 BP42
INT3
T2O
SC
BP41
BP43
VMI
INT3
T2I
SD
BP50
INT6
BP52
INT1
BP51
INT6
BP53
INT1
BP60 BP63
T3O T3I
Rev. 4679Dâ4BMCUâ05/05
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