AS8267 datasheet(90/136 Pages) AMSCO

90 / 136 page

Data Sheet AS8267 / AS8268

Revision 1.0, 19-Jun-07

Page 90 of 136

8.8

8051 Microcontroller (MCU)

The MCU is a derivative of the well-known 8051 microcontroller. The MCU block consists of an 8051

compatible microprocessor core, Flash memory, data memory (X_RAM), squareroot calculation unit and two

UARTs for debugging and communication purposes. The Special Function Registers (SFR) section enfolds the

standard blocks like the 16 bit timer (Timer 0), 128 bytes of internal data memory (I_RAM) and a serial

interface (UART1). Furthermore, a squareroot block and a second serial interface (UART2) are also provided.

Timer 1, Port 0 to 3 and the UART are not implemented exactly the same as in the original 8051. Instead, the

bus extension (Port 0, 2 on single chip 8051) provides access to on-chip periphery, which comprises a serial

peripheral interface (SPI), a real time clock (RTC), nine general purpose I/Os (MPIO), the LCD driver (LCDD),

the DSP block that interfaces to the analog front end and system control registers (SCT). The MCU block is

configured as Von Neumann architecture with the program in the Flash memory staring from 0000h and the

data memory (X_RAM) and periphery section starting from 8000h up to FFFFh. All 64kB of memory can be

accessed with both, the MOVC instruction (for program fetches and data read) and the MOVX instruction (for

data read/store). The interrupt controller enfolds 7 internal interrupt sources, for having all necessary

peripherals already on chip.

MCU

In te rn a l

In te rr up t S o u r c e s

Interrupt

Control

CPU

Clock

Divider

128 bytes

I_RAM

Timer 0

32kB

FLASH

SQRT

UART2

1kB

X_RAM

UART1

Mclk

RXD

TXD

LCDD

RTC

SCT

MPIO

DSP

I/Os

AFE

Optional

Serial

EEPROM

Display

rxd2

txd2

SPI

M/S

Temperature

Sensor

Figure 17: MCU block diagram

Legend

CPU ................ 8051 compatible microcontroller core

I_RAM ............. 128 bytes static RAM, range 00h to 7Fh of 8051

X_RAM ............ 1024 bytes static RAM, (extended) memory for data storage

FLASH ............ 32kB Flash memory, primarily for program storage, maybe used also for data

Timer 0............ 16 bit timer (due to 8051 standard)

UART1 ............ serial interface RS232 (due to 8051 standard) with extended baudrate generator

UART2 ............ serial interface RS232 with extended baudrate generator

SQRT .............. square root calculation out of 5 bytes (40 bits) input, 2.5 bytes (20 bits) output

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