The MS51 is an embedded flash type, 8-bit high performance 1T 8051-based microcontroller. The instruction set is fully compatible with the standard 80C51 and performance enhanced. The MS51FB9AE contains an 16K Bytes of main Flash called APROM, in which the contents of User Code resides. The MS51 Flash supports In-Application-Programming (IAP) function, which enables on-chip firmware updates.

Features

Operating Characteristics
- Voltage range: 2.4V to 5.5V
- Temperature range: - 40C  to + 105C
- EFT 4 kV

Core
- 1T 8051-based CMOS microcontroller running up to 24 MHz

Memories
- 16 K bytes Flash
- Configurable 4 K / 3 K / 2 K / 1 K Bytes of LDROM, which provides flexibility to user developed Boot Code
- 1 K bytes SRAM
- 256 Bytes on-chip RAM
- Flash Memory accumulated with pages of 128 Bytes each
- Built-in In-Application-Programmable ( IAP )

Clocks
- External clock input ( 32 K body only )
- 16 MHz high-speed internal oscillator trimmed to +- 1 % when VDD 5.0 V, +- 2 % in all conditions.
- 24 MHz high-speed internal oscillator trimmed to +- 1 % when VDD 5.0 V, +- 2 % in all conditions
- 10 kHz low-speed internal oscillator
- On-the-fly clock source switch via software

Power management
- Brown-out detection ( BOD ) with low power mode available, 4-level selection, interrupt or reset options
- Power-on reset ( POR )

Peripherals
- Two 16-bit Timers / Counters 0 and 1 compatible with standard 8051
- One 16-bit Timer 2 with three-channel input capture module and 9 input pin can be selected
- One 16-bit auto-reload Timer 3, which can be the baud rate clock source of UARTs
- One 16-bit PWM counter interrupt for timer
- 6*16-bit pulse width modulator ( PWM ) output, with different modes and Fault Brake function for motor control
- One programmable Watchdog Timer ( WDT )
- One dedicated Self Wake-up Timer ( WKT )
- 2 full-duplex UART ports with frame error detection and automatic address recognition
- 1 SPI port with master and slave modes, up to 12 Mbps when system clock is 24 MHz
- 1 I²C bus with master and slave modes, up to 400 kbps data rate
- 8 channels of 12-bit ADC, up to 500 ksps converting rate
- 18 general purpose I / O pins and 1 input-only pin
- Programmable pull-ups pull-lows

Development Tools
- Nuvoton Nu-Link with KEILTM and IAR development environment
- Nuvoton Nu-Link In-Circuit-Programmer
- Nuvoton In-System-Programming ( ISP )