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When using this cycle, the absolute register address must be presented at Ports 1 and 2 as in the normal program cycle Port 2 should be 00H. Added lead-free package information to the Ordering Information table.

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The Serial Bootstrap Loader implements an easy-to-use command line interface which allows an application program in an Intel hex representation to datasheef loaded into and read back from the device. Also serves as the read strobe for Expanded 33 bus operation.

Also serves as the Timer 1 input. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. The serial loader is designed to operate across ds250 3-wire interface from a standard UART. At this 24 time, PSEN will be pulled down externally. Add minimum value to PCB thickness. The device that pulls down should be open-drain since it must not interfere with PSEN under normal operation.


Crystal start-up time is the time required to get the mass of the crystal into vibrational motion from the time that power is first applied to the circuit until the first clock pulse is produced by the on-chip oscillator. The serial loader responds to single character commands which are summarized below: When the DS T first detects a Parallel Program Strobe pulse or a Security Set Strobe pulse while in the Program Load Mode following a power-on reset, the internal hardware of the device is initialized so that an existing 4-kbyte program can be programmed into a DS T with little or no modification.

The hardware configuration which is required for the Serial Program Load Mode is illustrated in Figure 3. Also serves as the transmit dafasheet for the 21 on board UART.

Used to connect an external crystal to the internal oscillator. Also serves as the active low External 23 Interrupt 0.

DS2250, DS2250T Soft Microcontroller Module

All voltages are referenced to ground. The next 4 kbytes of embedded RAM are mapped as data memory. Also serves as the receive signal for the 19 on board UART.

Dss2250 can be performed over a standard asynchronous serial communications port. Furthermore, internal data registers and key configuration registers are also nonvolatile.

DS Datasheet, PDF – Alldatasheet

Then, program the DS T using either normal or expanded program cycles and check the memory contents using Verify cycles. Please review this summary carefully.


All nonvolatile memory and resources are maintained for over 10 years at room temperature in the absence of power. Also serves as the active low External 25 Interrupt 1. Removed 8kB package versions from Ordering Information table. Also serves as the Timer 0 input. Removed references to DSTK. This active low signal is used to enable an external program memory when using the Expanded bus. No circuit patent licenses are implied. EA – External Access.

First, set the contents of the MCON register with the correct range and partition only if using expanded programming cycles.

Also datasgeet as the write strobe for Expanded 31 bus operation. This should only be done once the DS T is already in a reset state. This port is open-drain and can not drive ds22250 4, 6, 8, 10, 12, logic 1. When using a parallel programmer, this pin also assumes the PROG function for datasheet pulses. No internal memory or clock will be available when this pin is at a logic low.

This data sheet provides ordering information, datadheet, and electrical specifications.

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