HT85F2240 datasheet(24/147 Pages) HOLTEK

24 / 147 page

Rev. 1.10

�4 of 147

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A/D Flash 8051 Core Low Pin Count MCU

HT85F2230/HT85F2240

12 PoweronResetElectricalCharacteristics

Ta=��°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

VPOR

VDD Start Vo�tage to ens�re Power-on Reset

—

100

RRPOR

VDD Rising Rate to ens�re Power-on Reset

—

0.0��

—

V/ms

tPOR

Minim�m Time for VDD sta�s at VPOR to ens�re

Power-on Reset

—

Ti me

V DD

V PO R

RR VD D

t PO R

13 System Architecture

A key factor in the high-performance features of the Holtek range of microcontrollers is attributed

to their internal system architecture. The range of devices take advantage of the usual features

found within 8051-based microcontrollers providing increased speed of operation and enhanced

performance. The pipelining scheme is implemented in such a way that instruction fetching and

instruction execution are overlapped, hence most instructions are effectively executed in one clock

cycle, with the exception of branch or call instructions. Compared with classic MCU architecture,

the 8051-based core runs at a much higher speed and with greatly reduced power consumption. An

8-bit wide ALU is used in practically all operations of the 8051 compatible instruction set. It carries

out arithmetic operations, logic operations, rotation, increment, decrement, branch decisions, etc.

The internal data path is simplified by moving data through the Accumulator and the ALU. Certain

internal registers are implemented in the Data Memory and can be directly or indirectly addressed.

The simple addressing methods of these registers along with additional architectural features

ensure that a minimum of external components is required to provide a functional I/O and A/D

control system with maximum reliability and flexibility.

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