Holtek BS83A04C Manual page 35

BS83A04C
4-Key Enhanced Touch I/O Flash MCU
• SCC Register
Bit 7
Name CKS2
R/W R/W
POR 0
Bit 7~5 CKS2~CKS0: System clock selection
000: f
001: f
010: f
011: f
100: f
101: f
110: f
111: f
These three bits are used to select which clock is used as the system clock source. In
addition to the system clock source directly derived from f
of the high speed system oscillator can also be chosen as the system clock source.
Bit 4~2 Unimplemented, read as 0
Bit 1 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 a "HALT" instruction.
FSIDEN: Low Frequency oscillator control when CPU is switched off
Bit 0
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 a "HALT" instruction.
• HIRCC Register
Bit 7
Name —
R/W —
POR —
Bit 7~2 Unimplemented, read as 0
Bit 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, 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
Bit 0
0: Disable
1: Enable
Rev. 1.00
6 5 4
CKS1 CKS0 —
R/W R/W —
0 0 —
H
/2
H
/4
H
/8
H
/16
H
/32
H
/64
H
SUB
6 5 4
— — —
— — —
— — —
35
3 2 1
— — FHIDEN FSIDEN
— — R/W
— — 0
or f , a divided version
H SUB
3 2 1
— — HIRCF HIRCEN
— — R
— — 0
March 24, 2020
0
R/W
0
0
R/W
1