AT91F40416 ATMEL Corporation, AT91F40416 Datasheet

AT91F40416

Manufacturer Part Number

AT91F40416

Description

At91 Arm(r) Thumb(r) Microcontroller

Manufacturer

ATMEL Corporation

Datasheet

1.AT91F40416.pdf (20 pages)

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Features

•

Description

The Real Time Clock (RTC) peripheral is designed for use with the AVR embedded

RISC core. It combines a complete time-of-day clock with alarm and a two-hundred

year Gregorian calendar, complemented by a programmable periodic interrupt. The

alarm and calendar registers are accessed by an 8-bit data bus.

The time and calendar values are coded in Binary-Coded Decimal (BCD) format. The

time format is 24-hour mode.

Updating time and calendar fields and configuring the alarm fields is performed by a

parallel capture on the 8-bit data bus. An entry control is performed to avoid loading

registers with incompatible BCD format data or with an incompatible date according to

the current month/year/century.

Year 2000 Conformity

The Real Time Clock Macrocell complies fully with the Year 2000 Conformity Require-

ments as stated in the British Standards Institution Document; Ref. BSI-DISC

PD2000-1: “Year 2000 conformity shall mean that neither performance nor functional-

ity is affected by dates prior to, during and after the year 2000”.

It has been tested to be compliant with the four associated rules:

1. No value for current date will cause any interruption in operation.

2. Date-based functionality must behave consistently for dates prior to, during and

3. In all interfaces and data storage, the century in any date must be specified either

4. Year 2000 must be recognized as a leap year.

The RTC represents the year as a four-digit number (..., 1998, 1999, 2000, 2001, etc.)

so that the century is unambiguously identified, in accordance with Rule 3.

Scan Test Configuration

The fault coverage is maximum if all non-scan inputs can be controlled and all non-

scan outputs can be observed. In order to achieve this, the ATPG vectors must be

generated on the entire circuit (top level) which includes the RTC or all RTC I/Os must

have a top level access and ATPG vectors must be applied to these pins.

Higher fault coverage may be achieved by applying manual vectors to the 32768

divider.

Low Power Consumption

Calendar from 1900 to 2099

Year 2000 Compliant

Programmable Periodic Interrupt Alarm Interrupt

AVR

Full Asynchronous Design

Full Scan Testable

Very Small Silicon Area

Test Vectors: at Least 93% Fault Coverage

Designed for Digital Keypad Applications (Parallel Load)

after year 2000.

explicitly or by unambiguous algorithms or inferencing rules.

User Interface Bus

Embedded RISC

Microcontroller

Core Peripheral

Real Time Clock

(RTC)

Rev. 1302B–07/01

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