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Introduction
The PSD9XX family of Programmable System Devices (for 8-bit microcontrollers) brings In-System-Programmability (ISP) to Flash memory and programmable logic. The result is a simple and flexible solution for embedded designs. PSD9XX devices combine many of the peripheral functions found in MCU based applications:
• Up to 2 Mbit of Flash memory
• A secondary 256 Kbit Flash memory
• Over 2,000 gates of Flash programmable logic
• Up to 256 Kbit SRAM
• Reconfigurable I/O ports
• Programmable power management.Key Features
❏ A simple interface to 8-bit microcontrollers that use either multiplexed or non-multiplexed busses. The bus interface logic uses the control signals generated by the microcontroller automatically when the address is decoded and a read or write is performed. A partial list of the MCU families supported include:
• Intel 8031, 80196, 80186, 80C251
• Motorola 68HC11, 68HC16, 68HC12, and 683XX
• Philips 8031 and 8051XA
• Zilog Z80, Z8, and Z180
❏ Internal 1 or 2 Mbit flash memory. This is the main Flash memory. It is divided into eight equal-sized blocks that can be accessed with user-specified addresses.
❏ Internal secondary 256 Kbit Flash memory. It is divided into four equal- sized blocks that can be accessed with user-specified addresses. This secondary memory brings the ability to execute code and update the main Flash concurrently.
❏ 16, 64 or 256 Kbit SRAM. The SRAM’s contents can be protected from a power failure by connecting an external battery.
❏ General Purpose PLD (GPLD) with 19 outputs. The GPLD may be used to implement external chip selects or combinatorial logic function.
❏ Decode PLD (DPLD) that decodes address for selection of internal memory blocks.
❏ 27 individually configurable I/O port pins that can be used for the following functions:
• MCU I/Os
• PLD I/Os
• Latched MCU address output
• Special function I/Os.
• 16 of the I/O ports may be configured as open-drain outputs.
❏ Standby current as low as 50 µA for 5 V devices.
❏ Built-in JTAG compliant serial port allows full-chip In-System Programmability (ISP). With it, you can program a blank device or reprogram a device in the factory or the field.
❏ Internal page register that can be used to expand the microcontroller address space by a factor of 256.
❏ Internal programmable Power Management Unit (PMU) that supports a low power mode called Power Down Mode. The PMU can automatically detect a lack of microcontroller activity and put the PSD9XX into Power Down Mode.
❏ Erase/Write cycles:
• Flash memory – 100,000 minimum
• PLD – 1,000 minimum
• Data Retention: 15 years -
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