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No circuit patent licenses are implied. The device that pulls down should be open-drain since it must not interfere with PSEN under dqtasheet operation. Also serves as the write strobe for Expanded 31 bus operation. All voltages are referenced to ground. Then, program the DS T using either normal or expanded program cycles and check the memory contents using Verify cycles.

Communication can be performed over a standard asynchronous serial communications port. First, set the contents of the MCON register with the correct range and partition only if using expanded programming cycles. Also serves as the Timer 0 input. This data sheet provides ordering information, pinout, and electrical specifications. This feature allows the loading of the application program to be delayed until the DS T is installed in the end system.

DS datasheet & applicatoin notes – Datasheet Archive

Used to connect an external crystal to the internal oscillator. Also serves as the transmit signal for the 21 on board UART. This should only be done once the DS T is already in a reset state. The Verify cycle is used to read this byte back for comparison with the originally loaded value to verify proper loading. The serial loader is designed to operate across a 3-wire interface from a standard UART.


Added lead-free package information to the Ordering Information table. The clock keeps time to a hundredth of a second using an on-board crystal. This mode is timing set-compatible with the 87C51H microcontroller programming mode. The timing associated with these cycles is illustrated in the electrical specs.

In a parallel programmer, this pin also serves as VPP for super voltage pulses.

DS2250 Datasheet PDF

As a result, software development packages which have been written for the are compatible with the DS Tincluding cross-assemblers, high-level language compilers, and debugging tools.

Also serves as the read strobe for Expanded 33 bus operation.

This port is open-drain and can not drive a 4, 6, 8, 10, 12, logic 1. Removed references to DSTK. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation.

DS (MAXIM) PDF技术资料下载 DS 供应信息 IC Datasheet 数据表 (1/18 页)

Datashete to absolute maximum rating conditions for extended periods of time may affect reliability. Removed 8kB package versions from Ordering Information table. All nonvolatile memory and resources are maintained for over 10 years at room temperature in the absence of power.

The user should check with the crystal vendor for the worst-case spec on this time. No internal memory or clock will be available when this pin is at a logic low. Also serves as the receive signal for the 19 on board UART.


The serial loader responds to single character commands which are summarized below: Intel hex is the typical format which existing cross-assemblers output. EA – External Access. Correct Figure 3 to show RST active high. Add minimum value to PCB thickness. When the DS T first detects a Parallel Program Strobe pulse or a Security Set Strobe pulse while in the Datahseet Load Mode following a power-on datashret, the internal hardware of the device is initialized datasgeet 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. A second 32k RAM is available for data only.

As illustrated in the figure, separate address spaces exist for program and data memory. It requires external pullups. Please review this summary carefully. The real time clock is a serial device that resides in this area. Since the basic addressing capability of the machine is 16 bits, a maximum of 64 kbytes of program memory and 64 kbytes of data memory can be accessed by the DS T CPU.

A typical application would use a sd2250 RSC serial interface to program the DS T as a final production procedure. Also serves as the active low External 23 Interrupt 0.

An optional datashete clock gives permanently powered timekeeping.