HT67F488 datasheet(128/171 Pages) HOLTEK

128 / 171 page

Rev. 1.60

1�8

�ove��e� �� 016

HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

Operation

Mode

Description

RX wake-up function

CPU

fSYS

fSUB

IDLE0 Mode

Off

When the CPU ente�s the IDLE0 �ode� a falling edge on

the RX pin will not tu�n on the fSYS clock and not wake up the

CPU even if UCR�.�(RIE)=1 and UCR�.3(WAKE)=1.

IDLE1 Mode

Off

When the UCR�.�(RIE)=1� UCR�.3(WAKE)=1 and the CPU

is ente�ed in IDLE1 �ode:

1. If the UART is not t�ansfe� and a falling edge occu��ed on

the RX pin� this will tu�n on fSYS and CPU is still off. If the

UART t�ans�ission is on going� CPU will �e woken up in

the end of t�ansfe�.

�. If the UART t�ans�ission is on going� the CPU will �e

woken up in the end of t�ansfe�.

�ote: If RIE=0� WAKE=1 and the UART t�ans�ission is on

going� the CPU will not �e woken up in the end of

�eceive.

IDLE1 Mode

Off

(fSYS=fH~fH/64) On

Off

When the UCR�.�(RIE)=1� UCR�.3(WAKE)=1 and the CPU

is ente�ed in IDLE1 �ode:

1. If the UART is not t�ansfe� and a falling edge occu��ed on

the RX pin� this will tu�n on fSYS and CPU is still off. If the

UART t�ans�ission is on going� CPU will �e woken up in

the end of t�ansfe�.

�. If the UART t�ans�ission is on going� the CPU will �e

woken up in the end of t�ansfe�.

�ote: If RIE=0� WAKE=1 and the UART t�ans�ission is on

going� the CPU will not �e woken up in the end of

�eceive.

SLEEP0/1 Mode Off

Off

Off On/Off

When the UCR�.�(RIE)=1� UCR�.3(WAKE)=1 and the CPU

is ente�ed in SLEEP �ode� a falling edge on the RX pin will

tu�n on fSYS and wake-up CPU.

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