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ISD2575 Datasheet(PDF) 11 Page - Winbond |
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ISD2575 Datasheet(HTML) 11 Page - Winbond |
11 / 42 page ISD2560/75/90/120 Publication Release Date: May 2003 - 11 - Revision 1.0 Programming The ISD2500 series is also ideal for playback-only applications, where single or multiple messages are referenced through buttons, switches, or a microcontroller. Once the desired message configuration is created, duplicates can easily be generated via a gang programmer. 7.2. OPERATIONAL MODES The ISD2500 series is designed with several built-in Operational Modes that provide maximum functionality with minimum external components. These modes are described in details as below. The Operational Modes are accessed via the address pins and mapped beyond the normal message address range. When the two Most Significant Bits (MSB), A8 and A9, are HIGH, the remaining address signals are interpreted as mode bits and not as address bits. Therefore, Operational Modes and direct addressing are not compatible and cannot be used simultaneously. There are two important considerations for using Operational Modes. First, all operations begin initially at address 0 of its memory. Later operations can begin at other address locations, depending on the Operational Mode(s) chosen. In addition, the address pointer is reset to 0 when the device is changed from record to playback, playback to record (except M6 mode), or when a Power-Down cycle is executed. Second, Operational Modes are executed when CE goes LOW. This Operational Mode remains in effect until the next LOW-going CE signal, at which point the current mode(s) are sampled and executed. TABLE 2: OPERATIONAL MODES Mode [1] Function Typical Use Jointly Compatible [2] M0 Message cueing Fast-forward through messages M4, M5, M6 M1 Delete EOM markers Position EOM marker at the end of the last message M3, M4, M5, M6 M2 Not applicable Reserved N/A M3 Looping Continuous playback from Address 0 M1, M5, M6 M4 Consecutive addressing Record/playback multiple consecutive messages M0, M1, M5 M5 CE level-activated Allows message pausing M0, M1, M3, M4 M6 Push-button control Simplified device interface M0, M1, M3 [1] Besides mode pin needed to be “1”, A8 and A9 pin are also required to be “1” in order to enter into the related operational mode. [2] Indicates additional Operational Modes which can be used simultaneously with the given mode. |
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