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The AT87LV51 is a low-voltage, high-performance CMOS 8-bit microcontroller with 4K bytes of QuickFlash One-Time Programmable (OTP) Read Only memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry standard MCS-51 instruction set and pinout when Read Microcontroller .
The on-chip QuickFlash allows the program memory to be user programmed by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with QuickFlash on a monolithic chip, the Atmel AT87LV51 is a powerful microcontroller that provides a highly flexible and cost-effective solution to many embedded control applications before Read Microcontroller .
The AT87LV51 provides the following standard features: 4K bytes of QuickFlash OTP program memory, 128 bytes of RAM, 32 I/O lines, two 16-bit timer/counters, a five-vector, 2-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT87LV51 is designed with static logic for operation down to zero frequency and supports two software-selectable power-saving modes if Read Microcontroller .
The Idle mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The Power-down mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset. XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier, which can be configured for use as an on-chip oscillator as shown in Figure 1 after Read Microcontroller .
Either a quartz crystal or ceramic resonator may be used. To drive the device from an external clock source, XTAL2 should be left unconnected while XTAL1 is driven as shown in Figure 2. There are no requirements on the duty cycle of the external clock signal, since the input to the internal clocking circuitry is through a divide-by-two flip-flop, but minimum and maximum voltage high and low time specifications must be observed if Read Microcontroller .
In Idle Mode, the CPU puts itself to sleep while all the on chip peripherals remain active. The mode is invoked by software. The content of the on-chip RAM and all the Special Function registers remains unchanged during this mode. The Idle mode can be terminated by any enabled interrupt or by a hardware reset when Read Microcontroller .
It should be noted that when Idle is terminated by a hardware reset, the device normally resumes program execution from where it left off, up to two machine cycles before the internal reset algorithm takes control. On-chip hardware inhibits access to internal RAM in this event, but access to the port pins is not inhibited before Read Microcontroller .
To eliminate the possibility of an unexpected write to a port pin when Idle is terminated by reset, the instruction following the one that invokes Idle should not be one that writes to a port pin or to external memory after Read Microcontroller .
