The original 8052 had a 12-clock structure, one machine cycle required 12 clocks, and most instructions were one or two machine cycles. So, in addition to the multiplication and division instructions, each instruction in 8052 uses 12 or 24 clocks, and in addition, each cycle in 8052 uses two memory retrievals. In many cases, the second one is a fake extraction, and the extra clock is wasted.

The OB38A08A2 is a fast single-chip 8-bit microcontroller core. This is a full-featured 8-bit embedded controller that executes all ASM51 instructions with the same instruction settings as the MCS-51.

Features

Operating voltage: 2.4V ~ 5.5V

High-speed 1T architecture up to 8MHz

The 1~8T mode can be programmed by software

Command settings are MCS-51 compatible

Built-in 8MHz RC oscillator and programmable divider

8KB bytes of on-chip programmable memory in program memory

256B bytes of standard 8052 RAM

Dual 16-bit data pointers (DPTR0&DPTR1)

A serial interface for full-duplex communication. Additional baud rate generator

Four 16-bit timers/counters (timers 0,1,2,3)

Up to 18 GPIOs (8L~20L package pins), GPIOs can be selected in four types (quasi-bidirectional port, push-pull, open-drain, input only), default quasi-bidirectional port (pull-up)

External Interrupt 0 & External Interrupt 1 with four levels of priority

Programmable Watchdog Timer (WDT)

One IIC interface (master/slave mode)

2 x 10-bit Pulse Width Modulation (PWM)

3 x 16-bit Compare (PWM)/Capture/Reload (CCU)

8 x 12-bit analog-to-digital (ADC)

On-chip Comparator (CMP)

On-Chip Operational Amplifier (OPA)

The on-chip memory supports ICP and EEPROM functions

On-chip Simulation (ICE) and On-Chip Debugging (OCD)

Low Voltage Interrupt/Low Voltage Reset (LVI/LVR)

Pin ESD performance exceeds 4KV

Enhanced user code protection

The power management unit is in idle and power-down mode