BS66F340 Datasheet, PDF (78/256 Pages) Holtek Semiconductor Inc – Enhanced Touch A/D Flash MCU with LED Driver

BS66F340/BS66F350/BS66F360/BS66F370
Enhanced Touch A/D Flash MCU with LED Driver
Bit 1
Bit 0
FHIDEN: High Frequency oscillator control when CPU is switched off
0: Disable
1: Enable
This bit is used to control whether the high speed oscillator is activated or stopped
when the CPU is switched off by executing an "HALT" instruction.
FSIDEN: Low Frequency oscillator control when CPU is switched off
0: Disable
1: Enable
This bit is used to control whether the low speed oscillator is activated or stopped
when the CPU is switched off by executing an "HALT" instruction. The LIRC
oscillator is controlled by this bit together with the WDT function enable control when
the LIRC is selected to be the low speed oscillator clock source or the WDT function
is enabled respectively. If this bit is cleared to 0 but the WDT function is enabled, the
LIRC oscillator will also be enabled.
HIRCC Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
HIRC1 HIRC0 HIRCF HIRCEN
R/W
—
—
—
—
R/W
R/W
R/W
R/W
POR
—
—
—
—
0
0
0
1
Bit 7~4
Bit 3~2
Bit 1
Bit 0
Unimplemented, read as 0.
HIRC1~HIRC0: HIRC frequency selection
00: 8 MHz
01: 12 MHz
10: 16 MHz
11: 8 MHz
When the HIRC oscillator is enabled or the HIRC frequency selection is changed
by application program, the clock frequency will automatically be changed after the
HIRCF flag is set to 1.
HIRCF: HIRC oscillator stable flag
0: HIRC unstable
1: HIRC stable
This bit is used to indicate whether the HIRC oscillator is stable or not. When the
HIRCEN bit is set to 1 to enable the HIRC oscillator or the HIRC frequency selection
is changed by application program, the HIRCF bit will first be cleared to 0 and then
set to 1 after the HIRC oscillator is stable.
HIRCEN: HIRC oscillator enable control
0: Disable
1: Enable
Rev. 1.40
78
December 15, 2016