BS83B08-3 Datasheet, PDF (37/141 Pages) Holtek Semiconductor Inc – 8-Bit Touch Key Flash MCU

BS83B08-3/B12-3/B16-3/B16G-3/C24-3
8-Bit Touch Key Flash MCU
CTRL Register
Bit
7
6
5
4
3
2
1
0
Name
RESBF
¾
HIRCS1 HIRCS0
¾
¾
¾
¾
R/W
R/W
¾
R/W
R/W
¾
¾
¾
¾
POR
x
¾
0
0
¾
¾
¾
¾
Bit 7
RESBF: Reset pin reset flag
described elsewhere
²x² unknown
Bit 6
Bits 5,4
unimplemented, read as ²0²
HIRCS1, HIRCS0: High frequency clock select
00: 8MHz
01: 16MHz
10: 12MHz
11: 8MHz
Bits 3,2
Bits 1,0
unimplemented, read as ²0²
Reserved bits, must not be modified.
Internal Low Speed RC Oscillator - LIRC
The Internal 32kHz System Oscillator is the low frequency oscillator. It is a fully integrated RC
oscillator with a typical frequency of 32kHz at 5V, requiring no external components for its
implementation. Device trimming during the manufacturing process and the inclusion of internal
frequency compensation circuits are used to ensure that the influence of the power supply voltage,
temperature and process variations on the oscillation frequency are minimised. After power on this
LIRC oscillator will be permanently enabled; there is no provision to disable the oscillator using
register bits.
Rev. 1.30
37
September 22, 2011