HT85F2240 datasheet(57/147 Pages) HOLTEK

57 / 147 page

Rev. 1.10

�7 of 147

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A/D Flash 8051 Core Low Pin Count MCU

HT85F2230/HT85F2240

Low Speed Oscillator Control Register – LSOCR

SFR Address: EEh

Bit

Name

—

LIRCRDY

—

LIRCEN

—

R/W

—

R/W

—

POR

—

Bit 7~5

Unimplemented, read as “0”

Bit 4

LIRCRDY: LIRC oscillator ready indication flag

0: Not ready

1: Ready

This is the internal low frequency oscillator, LIRC, ready indication bit which indicates

if the LIRC oscillator is stable or not. This bit will be automatically cleared to zero by

hardware when the LIRC is disabled.

Bit 3~2

Unimplemented, read as “0”

Bit 1

LIRCEN: LIRC oscillator select bit

0: Enable

1: Disable

Bit 0

Unimplemented, read as “0”

Operation Modes

There are three different modes of operation for the microcontroller, each one with its own

special characteristics and which can be chosen according to the specific performance and

power requirements of the application. There is one mode allowing normal operation of the

microcontroller, the NORMAL Mode, in which all oscillators and function remain active. There

are also two low power modes, the IDLE mode and the Power-Down Mode. In the IDLE mode,

the microcontroller CPU will stop and instruction execution will cease, however, the high speed

oscillators will continue to run and can continue to provide a clock source for the peripheral

functions such as WDT, Time Base, Timers and ADC. The slow speed oscillator will also continue

to run and keep the WDT and Time Base functions active, if its clock source is not the system

clock. In the Power-Down mode all oscillators are stopped and therefore all functions cease

operation.

Operating Mode

NORMAL Mode

IDLE Mode

Power-Down Mode

CPU C�ock

Off

Periphera� C�ock(Note)

Off

Low Freq�enc� Interna� RC

Osci��ator (LIRC)

On (LIRCEN=0) / Off

Off

High Freq�enc� XTAL

Osci��ator (HXT)

On (HXTEN=1) / Off

Off

High Freq�enc� Interna� RC

Osci��ator (HIRC)

On (HIRCEN=1) / Off

Off

Note: Periphera� C�ock is the c�ock for Timer 0� Timer 1� Timer �� PCA and ADC.

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