上海贝岭股份有限公司
Shanghai Belling Co., Ltd.
BL22P14 USER MANUAL
BM22P14用户手册
DDRA
PB
$01
$02
R/W
0000 0000
--00 0000
--00 0000
0000 1000
--00 0000
0000 0000
00-0 0000
0000 0000
0000 0000
0000 0000
--00 0000
0000 0000
0000 --00
00u- --00
0000 0000
---- rrrr
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
W
DDRB
KBIM
$03
$04
PBPR
T0D
$05
$06
T0C
$07
T1DH
T1DL
$08
$09
T1C
$0A
$0B
$0C
$0D
$0E
$0F
$10
INTC0
INTC1
BZCR
MCR1
MCR2
RSTFR
LCDD[9:0]
LCDCON
$79-$70
$7A
xxxx xxxx
0000 0000
R/W
NOTE:
- : Not used;
x: Undefined;
u: Determined by OPBIT[4];
r: Determined by reset type
5.4 Clock
Device supplies four clock sources: Crystal oscillator, external RC, RTC and WDT. First
three clock sources can be as system clock Fsys and all can be as internal clock Fs.
5.4.1 System Clock: Fsys
System clock is main operate clock for device. It is configured by OTP OPTION BIT
（FSYS1, FSYS0）to select a clock source.
FSYS1、FSYS0
00 / 11：Fsys=Fosc/2
01：
10：
Fsys=Frc/2
Fsys=Frtc/2
5.4.2 Internal Clock: Fs
Fs is the clock of Buzzer, RTC interrupt, Time Base interrupt, LCD and Watchdog. It is
configured by OTP OPTION BIT（FS1, FS0）to select a clock source. If RTC or WDT is
selected, device will still operate in stop mode.
FS1、FS0
00 / 11：Fs=Fsys
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