HT85F2270 datasheet(28/226 Pages) HOLTEK

28 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

13 PoweronResetElectricalCharacteristics

Ta=��°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

VPOR

VDD Start Voltage to ensure Power-on Reset

—

100

RRPOR

VDD Rising Rate to ensure Power-on Reset

—

0.0��

—

V/ms

tPOR

�inimum Time for VDD sta�s at VPOR to ensure

Power-on Reset

—

Ti me

V DD

V PO R

RR VD D

t PO R

14 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 control

system with maximum reliability and flexibility.

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