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The next 4 kbytes of embedded RAM are mapped as data memory. The user should check with the crystal vendor for the worst-case spec on this time. This initialization may be performed in one of two ways: The hardware configuration which is required for the Serial Program Load Mode is illustrated in Figure 3.

Up to 32 kbytes of program code can be entered and verified.

DS2250 Datasheet PDF

The serial loader is designed to operate across a 3-wire interface from a standard UART. Add minimum value to PCB thickness.

Also serves as the Timer 1 input. It is normally an output and should be unconnected if not used. The serial loader responds to single character commands which are summarized below: Intel hex is the typical format which existing cross-assemblers output.

A typical parallel loading session would follow this procedure. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

First, set the contents of the MCON register with the correct range and partition only if using expanded programming cycles. In 9 Input Instr. Then, program the DS T using either normal or expanded program cycles and check the memory contents using Verify cycles. No internal memory or clock will be available when this pin is at a logic low. Removed 8kB package versions from Ordering Information table. The real time clock is a serial device that resides in this area.


The Security Set cycle may be used to enable and the software security feature. In a parallel programmer, this pin also serves as VPP for super voltage pulses. When used in this mode, dztasheet does not require pullups. This active low signal is used to enable an external program memory when using the Expanded bus.

DS datasheet & applicatoin notes – Datasheet Archive

Added lead-free package information to the Ordering Information table. Also serves as the receive signal for the 19 on board UART. 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. At this 24 time, PSEN will be pulled down externally. 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.

An optional real-time clock gives permanently powered timekeeping. This mode is timing set-compatible with the 87C51H microcontroller programming mode. As illustrated in the figure, separate address spaces exist for program and data memory. This initialization automatically sets the range address for 8 kbytes and maps the lowest 4-kbyte bank of embedded RAM as program memory.

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

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.


This port is open-drain and can not drive a 4, 6, 8, 10, 12, logic 1. Please review this summary carefully. This data sheet provides ordering information, pinout, and electrical specifications. A typical application would use a simple RSC serial interface to program the DS T as a final production procedure. 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 Verify cycle is used to read this byte back for comparison with the originally loaded value to verify proper loading.

The receive, transmit, and ground wires are all that are sd2250 to establish communication with the DS T. Also serves as the read strobe for Expanded 33 bus operation. Also serves as the transmit signal for the 21 on board UART. No circuit patent licenses are implied. The device that pulls down should be open-drain since it must not interfere with PSEN under normal operation.

The clock keeps time to a hundredth of a second using an on-board crystal.

The timing associated with these cycles is illustrated in the electrical specs. An RC power-on reset circuit is not needed and is not recommended. Furthermore, internal data registers and key configuration registers are also nonvolatile. It requires external pullups. Used to connect an external crystal to the internal oscillator.