AS8218 datasheet(78/123 Pages) AMSCO

78 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 78 of 123

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

SPI.................. serial peripheral interface, used to access an external EEPROM

Bootload .......... downloads program data after reset, combined with the SPI

LCDD .............. LCD driver block

RTC ................ real time clock, time/data may be set via UART1 (SCT)

MPIO............... multi-purpose I/O pins, configurable inputs and outputs

DSP ................ digital signal processing unit interfaces to analog front end (AFE)

AFE................. analog front end, includes amplifiers and A to D converters

SCT ................ system control unit, combined with UART1 used for debugging/programming of the device

Key Features

8051 compatible 8 bit oriented microcontroller core

128 bytes of internal data memory (I_RAM)

24kB program memory (P_RAM)

1kB data memory (X_RAM)

Von Neumann architecture, shared program and data memory

Cycle optimized compared to standard 8051, some instructions are executed in a single clock cycle

128 bytes of SFR range

Standard SFRs: Timer 0, UART1 (with 16 baudrate reg.)

Specific SFRs: UART2 (with 16 bit baudrate reg.), SQRT block

Fully compatible 8051 instruction set including DA, MUL and DIV instruction

7 internal interrupt sources

Ports P0, P1, P2, P3 are not implemented

P0 and P2 are accessible as registers

No idle mode via PCON

Automatic bootload of application program after power-on reset

6 clock cycles per instruction (12 cycles in standard 8051)

1 data pointer DPTR

AS8218 датащи(PDF) 78 Page - ams AG