ATAM894_14 Datasheet, PDF (1/97 Pages) ATMEL Corporation – Read Protection for the EEPROM Program Memory

Features
• 8 K × 8-bit EEPROM
• EEPROM Programmable Options
• Read Protection for the EEPROM Program Memory
• 256 × 4-bit RAM
• 2 × 32 × 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 Atmel’s family of 4-bit single chip microcontrollers
with 8K × 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
V_SS V_DD
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. 4679D–4BMCU–05/05