Digilent 410-218P-KIT Bedienungsanleitung PDF herunterladen

™

Revision: October 17, 2011

Note: This document applies to REV A of the board.

1300 NE Henley Court, Suite 3

Pullman, WA 99163

(509) 334 6306 Voice | (509) 334 6300 Fax

Doc: 502-218 page 1 of 2

Overview

The PmodRTCC is a real-time clock/calendar

Features include:

• a real-time clock/calendar with lithium

coin cell back-up

• an I

C interface

• multi-function pin output that can

generate a square wave

• two available alarms

• 128 bytes EEPROM

• 64 bytes SRAM

Functional Description

The PmodRTCC can communicate using I

via the 8-pin header J2. Digilent boards

implement several different I

C interfaces. For

more information, see the Connecting I

Interfaces document available at

www.digilentinc.com.

Interface

All communications with the device must

specify whether to write to the EEPROM or the

RTCC registers/SRAM, as well as a register

address and a flag indicating whether the

communication is a read or a write. This is

followed by the actual data transfer.

The PmodRTCC responds to two I

addresses. Address ‘1010111’ is used for

access to the EEPROM, and address

‘1101111’ is used for access to RTCC

registers/SRAM.

The device is configured by writing to the

registers within the device. The time registers

can be set to specific values and a control

A full list of registers and their functionality, as

well as communication specifications, can be

found in the MCP79410 datasheet available at

the Microchip website.

The I

C interface standard uses two signal

lines. These are I2C data (SDA) and serial

clock (SCLK). These signals map to the serial

data (SDA) and serial clock (SCLK) on the

MCP79410.

Power Back-up

The PmodRTCC has a holder for a 12mm

lithium coin cell to power the RTCC and SRAM

if VDD should ever fall below the operating

point. In order to enable this power back-up,

the VBATEN bit must be set in the RTCC

registers. Compatible coin cells include

BR1216, CR1216, BR1220, CL1220, CR1220,

and BR1225.

Connector J2 – I2C Communications

Pin Signal Description

1, 2 SCL I2C Clock

3, 4 SDA I2C Data

5, 6 GND Power Supply Ground

7, 8 VCC Power Supply (3.3V)

1 2

Inhaltsverzeichnis

Seite 1 - Functional Description

PPmmooddRRTTCCCC™™ RReeffeerreennccee MMaannuuaall Revision: October 17, 2011 Note: This document applies to REV A of the board. 1300 NE Henley C

Seite 2 - Calibration

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Digilent 410-218P-KIT Bedienungsanleitung

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