The AT89C51AC3-S3SUM is a high-performance 8-bit single-chip Flash Microcontroller. In X2 mode a maximum external clock rate of 20MHz reaches a 300ns cycle time. Besides the AT89C51AC3 provides 64kB of flash memory including In-system programming (ISP) and IAP, 2kB boot flash memory, 2kB EEPROM and 2048B ERAM.
80C51 Core architecture
Boot code section with independent lock bits
In-system programming by on-chip UART boot program and IAP capability
Integrated power monitor (POR - PFD) to supervise internal power supply
14-sources 4-level Interrupts
Three 16-bit timers/counters
Full duplex UART compatible 80C51
Five ports - 32 + 4 digital I/O lines
Five-channel 16-bit PCA
Double data pointer
21-bit Watchdog timer (7 Programmable bits)
10-bit resolution Analog-to-digital converter (ADC) with 8 multiplexed Inputs
(EN)
