MS51EC0AE

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 MS51BA9AE / MS51DA9AE 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 onchip firmware updates. IAP also makes it possible to configure any block of User Code array to be used
as non-volatile data storage, which is written by IAP and read by IAP or MOVC instruction, this function
means whole 8K Bytes area all can be use as Data Flash through IAP command. MS51 support an
function of configurationable Flash from APROM called LDROM, in which the Boot Code normally
resides for carrying out In-System-Programming (ISP). The LDROM size is configurable with a
maximum of 4K Bytes by CONFIG define. There is an additional include special 128 bytes security
protection memory (SPROM) to enhance the security and protection of customer application. To
facilitate programming and verification, the Flash allows to be programmed and read electronically by
parallel Writer or In-Circuit-Programming (ICP). Once the code is confirmed, user can lock the code for
security.
The MS51BA9AE / MS51DA9AE provides rich peripherals including 256 Bytes of SRAM, 1K Bytes of
auxiliary RAM (XRAM), Up to 12 general purpose I/O, two 16-bit Timers/Counters 0/1, one 16-bit Timer2
with three-channel input capture module, one Watchdog Timer (WDT), one Self Wake-up Timer (WKT),
one 16-bit auto-reload Timer3 for general purpose or baud rate generator, two UARTs with frame error
detection and automatic address recognition, one SPI, one I2
C, five enhanced PWM output channels,
eight-channel shared pin interrupt for all I/O, and one 12-bit ADC. The peripherals are equipped with 18
sources with 4-level-priority interrupts capability.
The MS51BA9AE / MS51DA9AE is equipped with three clock sources and supports switching on-thefly via software. The three clock sources include external clock input, 10 kHz internal oscillator, and one
16 MHz internal precise oscillator that is factory trimmed to ±1% at room temperature. The MS51
provides additional power monitoring detection such as power-on reset and 4-level brown-out detection,
which stabilizes the power-on/off sequence for a high reliability system design.
The MS51BA9AE / MS51DA9AE microcontroller operation consumes a very low power with two
economic power modes to reduce power consumption － Idle and Power-down mode, which are
software selectable. Idle mode turns off the CPU clock but allows continuing peripheral operation.
Power-down mode stops the whole system clock for minimum power consumption. The system clock of
the MS51 can also be slowed down by software clock divider, which allows for a flexibility between
execution performance and power consumption.
With high performance CPU core and rich well-designed peripherals, the MS51 benefits to meet a
general purpose, home appliances, or motor control system accomplishment.