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Program Memory Interface

– Contains Pro-

gram Counter (PC) and related logic. It per-

forms the instructions code fetching. Program

Memory can be also written. This feature al-

lows usage of a small boot loader loading new

program into ROM, RAM, EPROM or FLASH

EEPROM storage via UART, SPI, I2C or

DoCD™ module.

External Memory Interface

- Contains mem-

ory access related registers such as Data

Page High (DPH), Data Page Low (DPL) and

Data Pointer eXtended (DPX) registers. It per-

forms the external Program and Data Memory

addressing and data transfers. Program fetch

cycle length can be programmed by user. This

feature is called Program Memory Wait States,

and allows core to work with different speed

program memories.

Internal Data Memory Interface

– Internal

Data Memory interface controls access into the

internal 256 bytes memory. It contains 8-bit

Stack Pointer (SP) register and related logic.

User SFRs Interface

– Special Function Reg-

isters interface controls access to the special

registers. It contains standard and used de-

fined registers and related logic. User defined

external devices can be quickly accessed

(read, written, modified) using all direct ad-

dressing mode instructions.

Interrupt Controller

– Interrupt control module

is responsible for the interrupt manage system

for the external and internal interrupt sources.

It contains interrupt related registers such as

Interrupt Enable (IE), Interrupt Priority (IP),

Extended Interrupt Enable (EIE), Extended

Interrupt priority (EIP) and (TCON) registers.

I/O Ports

– Block contains 8051’s general pur-

pose I/O ports. Each of port’s pin can be

read/write as a single bit or as an 8-bit bus

called P0, P1, P2, P3.

Power Management Unit

– Block contains

advanced power saving mechanisms with

switchback feature, allowing external clock

control logic to stop clocking (Stop mode) or

run core in lower clock frequency (Power Man-

agement Mode) to significantly reduce power

consumption.

Switchback

feature

allows

UARTs, and interrupts to be processed in full

speed mode if enabled. It is very desired when

microcontroller is planned to use in portable

and power critical applications.

DoCD™ Debug Unit

– it’s a real-time hard-

ware debugger provides debugging capability

of a whole SoC system. In contrast to other on-

chip debuggers DoCD™ provides non-intrusive

debugging of running application. It can halt,

run, step into or skip an instruction, read/write

any contents of microcontroller including all

registers, internal, external, program memo-

ries, all SFRs including user defined peripher-

als. Hardware breakpoints can be set and con-

trolled on program memory, internal and exter-

nal data memories, as well as on SFRs. Hard-

ware breakpoint is executed if any write/read

occurred at particular address with certain data

pattern or without pattern. The DoCD™ system

includes three-wire interface and complete set

of tools to communicate and work with core in

real time debugging. It is built as scalable unit

and some features can be turned off to save

silicon and reduce power consumption. A spe-

cial care on power consumption has been

taken, and when debugger is not used it is

automatically switched in power save mode.

Finally whole debugger is turned off when de-

bug option is no longer used.

Floating Point Unit

– Block contains floating

point arithmetic IEEE-754 compliant instruc-

tions (C float, int, long int types supported). It

is used to execute single precision floating

point operations such as: addition, subtraction,

multiplication, division, square root, compari-

son absolute value of number and change of

sign. Basing on specialized CORDIC algorithm

a full set of trigonometric operations are also

allowed: sine, cosine, tangent, arctangent. It

also has built-in integer to floating point and

vice versa conversion instructions. FPU sup-

ports single precision real numbers, 16-bit and

32-bit signed integers. This unit has included

standard software interface allows easy usage

and interfacing with user C/ASM written pro-

grams.

Multiply Divide Unit

– It’s a fixed point fast

16-bit and 32-bit multiplication and division

unit. It provides shift and normalize operations,

additionally. All operations are performed using

unsigned integer numbers. The MDU contains

MD0 to MD5 operands, the result registers and

one control register called ARCON. This unit

has included standard software interface al-

lows easy usage and interfacing with user

C/ASM written programs.

Timers

– System timers module. Contains two

16 bits configurable timers: Timer 0 (TH0,