BC68F0031 Datasheet, PDF (36/148 Pages) Holtek Semiconductor Inc – I/O RF Transparent Transmission Flash MCU

BC68F0031
I/O RF Transparent Transmission Flash MCU
High Speed
Oscillator
HIRC
IDLE0
SLEEP
Low Speed
Oscillator
LIRC
IDLE2
SLEEP
fH/2
fH/4
fH
Prescaler
fH/8
fH/16
fSYS
fH/32
f_H/64
f_SUB
CKS2~CKS0
fSUB
fLIRC
WDT
fSUB
fSYS/4
fSYS
fPSC
Prescaler
Time
Base 0/1
CLKSEL[1:0]
Device Clock Configurations
Note: When the system clock source fSYS is switched to fSUB from fH, the high speed oscillator will
stop to conserve the power or continue to oscillate to provide the clock source, fH ~ fH/64, for
the peripheral circuits 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 FAST Mode and SLOW Mode. The remaining four modes, the SLEEP, IDLE0,
IDLE1 and IDLE2 Mode are used when the microcontroller CPU is switched off to conserve power.
Operation
Mode
CPU
Register Setting
FHIDEN FSIDEN CKS2~CKS0
fSYS
fH
fSUB
fLIRC
FAST On
x
SLOW On
x
IDLE0 Off
0
x
000~110
fH~fH/64
On
On
On
x
111
fSUB
On/Off ⁽¹⁾ On
On
000~110
Off
1
111
On
Off
On
On
IDLE1 Off
1
1
xxx
On
On
On
On
IDLE2 Off
1
SLEEP Off
0
000~110
On
0
111
Off
0
xxx
Off
On
Off
On
Off
Off On/Off ⁽²⁾
"x": Don’t care
Note: 1. The fH clock will be switched on or off by configuring the corresponding oscillator enable
bit in the SLOW mode.
2. The fLIRC clock can be switched on or off which is controlled by the WDT function being
enabled or disabled in the SLEEP mode.
Rev. 1.01
36
April 11, 2017