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This pin forces the DS T to behave like an In 9 Input Instr. 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. At datasheet 24 time, PSEN will be pulled down externally.

The user should check with the crystal vendor for the worst-case spec on this time. Also serves as the active low External 25 Interrupt 1.

Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. This feature allows the loading of the application program to be delayed until the DS T is installed in the end system. ds22500

It requires external pullups. The serial loader is designed to operate across a 3-wire interface from a standard UART. This active low signal is used to enable an external program memory when using the Expanded bus.

First, set the contents of the MCON register with the correct range and partition only if using expanded programming cycles. Correct Figure 3 to show RST active high. Also serves as the active low External 23 Interrupt 0. Then, program the DS T using either normal or expanded program cycles and check the memory contents using Verify cycles. The Verify cycle is used to read this byte back for comparison with the originally loaded value to verify proper loading.


The real time clock is a serial device that resides in this area. All nonvolatile memory and resources are maintained for over 10 years at room temperature in the absence of power.

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The device that pulls down should be open-drain since it must not interfere with PSEN under normal operation. Also serves as the Timer 1 input. The next 4 kbytes of embedded RAM are mapped as data memory.

This mode is timing set-compatible with the 87C51H microcontroller programming mode.

Also serves as the Timer 0 input. 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. Used to connect an external crystal to the internal oscillator. The hardware configurations used to select these modes of operation are illustrated in Figure 3.

This initialization may be performed in one of two ways: No circuit patent licenses are implied. No internal memory or clock will be available when this pin is at a logic low. This should only be done once the DS T is already in a reset state.

An RC power-on reset circuit is not needed and is not recommended. Add minimum value to PCB thickness. 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. All voltages are referenced to ground.

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. Please review this summary carefully.

This data sheet provides ordering information, pinout, and electrical specifications. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation. The clock keeps time to a hundredth of a second using an on-board crystal. An optional real-time clock gives permanently powered timekeeping.


Also serves as the transmit signal for the 21 on board UART. This initialization automatically sets the range address for 8 kbytes and maps the lowest 4-kbyte bank of embedded RAM as program memory. Intel hex is the dwtasheet format which existing cross-assemblers output.

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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.

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.

Furthermore, internal data registers and key configuration registers are also nonvolatile. Also serves as the write strobe for Expanded 31 bus operation.

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It is normally an output and should be unconnected if not used. Communication can be performed over a standard asynchronous serial communications datahseet.

The timing associated with these cycles is illustrated in the electrical specs. A logic 1 applied to this pin will activate a reset state. A typical parallel loading session would follow this procedure.

When using a parallel programmer, this pin also assumes the PROG function for programming pulses. Daatsheet references to DSTK.

A typical application would use a simple RSC serial interface to program the DS T as a final production procedure.

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