Cypress AN2034 manual

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- informations concerning technical data of Cypress AN2034
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Table of contents for the manual

  • Page 1

    User Interface - Keypad Scan, PSoC ® Style January 16, 2009 Document No. 001-40409 Rev. *A 1 AN2034 Author : Dave Van Ess Associated Project : Yes Associated Part Family : CY8C20x34, CY8C 21x23, CY8C21x34 CY8C23x33, CY8C24x 23A, CY8C24x94 CY8C27x43, CY8C29x66 GET FREE SAMPLES HERE Software Version : PSoC Designer™ 5.0 Associated Application Note[...]

  • Page 2

    AN2034 January 16, 2009 Document No. 001-40409 Rev. *A 2 PSOC General Purpose IO To detect single-s witch closures, use the following algorithm:  Drive all rows simultaneousl y and re ad the columns.  Drive all columns simultaneou sly and read the rows.  Condense this data to determ i ne switch-closure status. The structure of the genera l[...]

  • Page 3

    AN2034 January 16, 2009 Document No. 001-40409 Rev. *A 3 Code 1: Subroutine for Re ading Keypad ;----------------------------------------- ; Keypad.asm ; ; This routine reads a 4 column by 4 row ; keypad on port1. The status of key ; closures is returned in A. ; ; P1.4 P1.5 P1.6 P1.7 ; C0 C1 C2 C3 ; P1.0 R0 --+----+----+----+- ; | | | | ; P1.1 R1 -[...]

  • Page 4

    AN2034 January 16, 2009 Document No. 001-40409 Rev. *A 4 Example Cod e 3 is the m ain function t hat implements the design in Figure 5 on pa ge 3. Code 3. Keypad Project I mplemented ;----------------------------------------- ; This program reads the keypad ; at port 1 and control the LEDs ; on port0. ; ; Copyright (c) ; Cypress Semiconductor 2002-[...]

  • Page 5

    AN2034 January 16, 2009 Document No. 001-40409 Rev. *A 5 Document History Document Title: User Interfa ce – Keypad Scan, PSoC ® Style Document Number: 00 1-40 409 Revision ECN Orig. of Change Submission Date Description of Change ** 1532004 OGNE 10/02/07 New publication of exist ing application not e. *A 2640952 JVY 01/20/09 Updated content. Add[...]