Philips P89LPC907 用户手册
Philips Semiconductors
User’s Manual - Preliminary -
P89LPC906/907/908
REAL-TIME CLOCK/SYSTEM TIMER
49
Table 6-2: Real-time Clock/System Timer Clock Source - P89LPC907,P89LPC908
0
1
1
00
RC Oscillator/DIVM
High frequency crystal
(XCLK)
01
Medium frequency crystal
(XCLK)
10
Low frequency crystal
(XCLK)
11
RC Oscillator/DIVM (CCLK)
1
0
0
00
WDT Oscillator/DIVM
High frequency crystal
(XCLK)
01
Medium frequency crystal
(XCLK)
10
Low frequency crystal
(XCLK)
11
WDT Oscillator/DIVM
(CCLK)
1
0
1
xx
undefined
1
1
0
1
1
1
00
external clock/DIVM
external clock
(XCLK)
01
10
11
external clock/DIVM (CCLK)
FOSC2
(UCFG1.2)
FOSC1
(UCFG1.1)
FOSC0
(UCFG1.0)
RTCS1:0
CCLK Frequency
RTC Clock Frequency
0
0
0
x
undefined
0
0
1
0
1
0
0
1
1
00
RC Oscillator/DIVM
undefined
01
10
11
RC Oscillator/DIVM (CCLK)
FOSC2
(UCFG1.2)
FOSC1
(UCFG1.1)
FOSC0
(UCFG1.0)
RTCS1:0
CCLK Frequency
RTC Clock Frequency