HT67F60 datasheet(60/242 Pages) HOLTEK

60 / 242 page

Rev. 1.50

March 06 , 2012

Rev. 1.50

March 06 , 2012

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPRO

System Operation Modes

There are six 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 are two modes allowing normal operation of the

microcontroller, the NORMAL Mode and SLOW Mode. The remaining four modes, the SLEEP0,

SLEEP1, IDLE0 and IDLE1 Mode are used when the microcontroller CPU is switched off to

conserve power.

Operation

Mode

Description

CPU

fSYS

fSUB

fTBC

NORMAL Mode

fH~ fH/64

SLOW Mode

IDLE0 Mode

Off

On/Off

IDLE1 Mode

Off

SLEEP0 Mode

Off

SLEEP1 Mode

Off

● NORMAL Mode

As the name suggests this is one of the main operating modes where the microcontroller has all of

its functions operational and where the system clock is provided by one of the high speed

oscillators. This mode operates allowing the microcontroller to operate normally with a clock

source will come from one of the high speed oscillators, either the HXT, ERC, EC or HIRC

oscillators. The high speed oscillator will however first be divided by a ratio ranging from 1 to 64,

the actual ratio being selected by the CKS2~CKS0 and HLCLK bits in the SMOD register.

Although a high speed oscillator is used, running the microcontroller at a divided clock ratio

reduces the operating current.

● SLOW Mode

This is also a mode where the microcontroller operates normally although now with a slower

speed clock source. The clock source used will be from one of the low speed oscillators, either the

LXT or the LIRC. Running the microcontroller in this mode allows it to run with much lower

operating currents. In the SLOW Mode, the fH is off.

● SLEEP0 Mode

The SLEEP Mode is entered when an HALT instruction is executed and when the IDLEN bit in

the SMOD register is low. In the SLEEP0 mode the CPU will be stopped, and the fSUB and fS

clocks will be stopped too, and the Watchdog Timer function is disabled. In this mode, the

LVDEN is must set to "0". If the LVDEN is set to "1", it won't enter the SLEEP0 Mode.

● SLEEP1 Mode

The SLEEP Mode is entered when an HALT instruction is executed and when the IDLEN bit in

the SMOD register is low. In the SLEEP1 mode the CPU will be stopped. However the fSUB and fS

clocks will continue to operate if the LVDEN is "1" or the Watchdog Timer function is enabled

and if its clock source is chosen via configuration option to come from the fSUB.

● IDLE0 Mode

The IDLE0 Mode is entered when a HALT instruction is executed and when the IDLEN bit in the

SMOD register is high and the FSYSON bit in the WDTC register is low. In the IDLE0 Mode the

system oscillator will be inhibited from driving the CPU but some peripheral functions will

remain operational such as the Watchdog Timer, TMs and LCD driver. In the IDLE0 Mode, the

system oscillator will be stopped. In the IDLE0 Mode the Watchdog Timer clock, fS, will either be

on or off depending upon the fS clock source. If the source is fSYS/4 then the fS clock will be off,

and if the source comes from fSUB then fS will be on.

HT67F60 Datasheet(PDF) 60 Page - Holtek Semiconductor Inc

HT67F60 Datasheet(HTML) 60 Page - Holtek Semiconductor Inc

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