The AT89S4051-24PU is a low-voltage, high-performance 8-bit CMOS Microcontroller with 4kB of In-system programmable (ISP) flash program memory. The device is manufactured using high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set. By combining a versatile 8-bit CPU with flash on a monolithic chip, the AT89S4051 is a powerful microcontroller which provides a highly-flexible solution. It is designed with static logic for operation down to zero frequency and supports two software-selectable power saving modes. 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 disabling all other chip functions until the next external interrupt or hardware reset.
● Compatible with MCS®51 products
● 0 to 24MHz Fully static operation
● Two-level program memory lock
● 256 x 8-bit Internal RAM
● 15 Programmable I/O lines
● Two 16-bit timers/counters
● Six interrupt sources
● Programmable serial UART channel
● Direct LED drive outputs
● On-chip analog comparator with selectable interrupt
● 8-bit PWM (Pulse-width modulation)
● Low power idle and power-down modes
● Brownout reset
● Enhanced UART serial port with framing error detection and automatic address recognition
● Internal power-on reset
● Interrupt recovery from power-down mode
● Programmable and fuseable x2 clock option
● Four-level enhanced interrupt controller
● Power-off flag
● Flexible programming (byte and page modes)
