BC68F2123 Datasheet, PDF (33/117 Pages) Holtek Semiconductor Inc – Sub-1GHz OOK/FSK TX Soc 1K Flash MCU

BC68F2123
Sub-1GHz OOK/FSK TX Soc 1K Flash MCU
f_H/2
High Speed Oscillator
f_H/4
f_H/8
HIRC
f_H
Prescaler fH/16
f_SYS
f_H/32
f_H/64
Low Speed Oscillator
LIRC
f_LIRC
f_L
HLCLK
CKS2~CKS0 bits
WDT
IDLEN
f_TBC
f_TB
f_SYS/4
Time Base 0
TBCK
Time Base 1
Device Clock Configurations
Note: When the system clock source fSYS is switched to fL from fH, the high speed oscillator will stop
to conserve the power. Thus there is no fH~fH/64 for peripheral circuit to use.
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.
Operating
Description
Mode
CPU
fSYS
fLIRC
fTBC
NORMAL mode
On
fH~fH/64
On
On
SLOW mode
On
fL
On
On
IDLE0 mode
Off
Off
On
On
IDLE1 mode
Off
On
On
On
SLEEP0 mode
Off
Off
Off
Off
SLEEP1 mode
Off
Off
On
Off
Rev. 1.00
33
January 11, 2017