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This should only be done once the DS T is already in a reset state. The serial loader is designed to operate across a 3-wire interface from a standard UART. Used dw2250 connect an external crystal to the internal oscillator. Added lead-free package information to the Ordering Information table. Add minimum value to PCB thickness. Furthermore, internal data registers and key configuration registers are also nonvolatile. An optional real-time clock gives permanently powered timekeeping.

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

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

Also serves as the active low External 25 Interrupt 1. The Serial Bootstrap Loader implements an easy-to-use command line interface which allows an application program in an Intel hex representation to be loaded into and read back from the device. The timing associated with these cycles is illustrated in the electrical specs.

This port is open-drain and can not drive a 4, 6, 8, 10, 12, logic 1. When used in this mode, it does not require pullups. Also serves as the Timer 0 input.


The device that pulls down should be open-drain since it must not interfere with PSEN vatasheet normal operation. A second 32k RAM is available for data only.

At this 24 time, PSEN will be pulled down externally.

DS2250 Datasheet PDF

The Security Set cycle may be used to enable and the software security feature. Intel hex is the typical format which existing cross-assemblers output. The serial loader responds to single character commands which are summarized below: A typical parallel loading session would follow this procedure. The next 4 kbytes of embedded RAM are mapped as data memory. A typical application would use a simple RSC serial interface to program the DS T as a final production procedure.

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.

Removed 8kB package versions from Ordering Information table. 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. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation. Please review this summary carefully. The user should check with the crystal vendor for the worst-case spec on this time. This pin forces the DS T to behave like an Also serves as the read strobe for Expanded 33 bus operation.


All voltages are referenced to ground.

It’s a community-based project which helps to repair anything. This active low signal is used to enable an external program memory when using the Datasheeet bus.

Also serves as the receive signal for the 19 on board UART. All nonvolatile memory and resources are maintained for over 10 years at room temperature in the absence of power. This mode is datasueet set-compatible with the 87C51H microcontroller programming mode.

When using a parallel programmer, this pin also assumes the PROG function for programming pulses. As illustrated in the figure, separate address spaces exist for program and data memory. The hardware configuration which is required for the Serial Program Load Mode is illustrated in Figure 3.

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.

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. It is normally an output and should be unconnected if not used.

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

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